```

                                                             OMB APPROVAL
                                                     OMB Number:       3235-0578
                                                     Expires:  January 31, 2016
                                                     Estimated average burden
                                                     hours per response.....
                                                     10.5

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-Q

                   QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS
    OF REGISTERED MANAGEMENT INVESTMENT COMPANY

  Investment Company Act file number 811-08547

                         Pioneer Series Trust XII
               (Exact name of registrant as specified in charter)

                       60 State Street, Boston, MA 02109
              (Address of principal executive offices) (ZIP code)

            Terrence J. Cullen, Pioneer Investment Management, Inc.,
                       60 State Street, Boston, MA 02109
                    (Name and address of agent for service)

Registrant's telephone number, including area code:  (617) 742-7825

Date of fiscal year end:   August 31

Date of reporting period:  November 30, 2015

Form N-Q is to be used by management investment companies, other than small
business investment companies registered on Form N-5 (239.24 and 274.5 of this
chapter), to file reports with the Commission, not later than 60 days after
close of the first and third fiscal quarters, pursuant to Rule 30b1-5 under
the Investment Company Act of 1940 (17 CFR 270.30b1-5).  The Commission may
use the information provided on Form N-Q in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q,
and the Commission will make this information public. A registrant is not
required to respond to the collection of information contained in Form N-Q
unless the Form displays a currently valid Office of Management and Budget
("OMB") control number. Please direct comments concerning the accuracy of the
information collection burden estimate and any suggestions for reducing the
burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW,
Washington, DC 20549-0609.  The OMB has reviewed this collection of information
under the clearance requirements of 44 U.S.C. ss. 3507.

<PAGE>
ITEM 1. Schedule of Investments.

File the schedules as of the close of the reporting period as set forth in
ss. 210.12-12  12-14 of Regulation S-X [17 CFR 210.12-12  12-14]. The
schedules need not be audited.
```

```

```

|                                                                                                                                                        |      |   |   | Pioneer Disciplined Growth Fund                                                                                                                                   |   |          |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------|--------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------|
|                                                                                                                                                        |      |   |   | Schedule of Investments 11/30/15 (unaudited)                                                                                                                      |   |          |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        | Shares    |   |   |                                                                                                                                                              |   | Value         |
|                                                                                                                                                        |      |   |   | COMMON STOCKS - 98.7%                                                                                                                                             |   |          |
|                                                                                                                                                        |      |   |   | Materials - 1.7%                                                                                                                                                  |   |          |
|                                                                                                                                                        |      |   |   | Specialty Chemicals - 1.7%                                                                                                                                        |   |          |
|                                                                                                                                                        | 150,329   |   |   | Ecolab, Inc.                                                                                                                                                      | $      | 17,913,204    |
|                                                                                                                                                        |      |   |   | Total Materials                                                                                                                                                   | $      | 17,913,204    |
|                                                                                                                                                        |      |   |   | Capital Goods - 7.1%                                                                                                                                              |   |          |
|                                                                                                                                                        |      |   |   | Aerospace & Defense - 2.9%                                                                                                                                    |   |          |
|                                                                                                                                                        | 297,910   |   |   | Honeywell International, Inc.                                                                                                                                     | $      | 30,967,744    |
|                                                                                                                                                        |      |   |   | Construction & Farm Machinery & Heavy Trucks - 2.3%                                                                                                       |   |          |
|                                                                                                                                                        | 231,667   |   |   | WABCO Holdings, Inc. *                                                                                                                                            | $      | 24,899,569    |
|                                                                                                                                                        |      |   |   | Industrial Machinery - 1.9%                                                                                                                                       |   |          |
|                                                                                                                                                        | 354,354   |   |   | Ingersoll-Rand Plc                                                                                                                                                | $      | 20,789,949    |
|                                                                                                                                                        |      |   |   | Total Capital Goods                                                                                                                                               | $      | 76,657,262    |
|                                                                                                                                                        |      |   |   | Transportation - 5.0%                                                                                                                                             |   |          |
|                                                                                                                                                        |      |   |   | Air Freight & Logistics - 2.8%                                                                                                                                |   |          |
|                                                                                                                                                        | 289,346   |   |   | United Parcel Service, Inc. (Class B)                                                                                                                             | $      | 29,805,531    |
|                                                                                                                                                        |      |   |   | Airlines - 2.2%                                                                                                                                                   |   |          |
|                                                                                                                                                        | 586,908   |   |   | American Airlines Group, Inc.                                                                                                                                     | $      | 24,215,824    |
|                                                                                                                                                        |      |   |   | Total Transportation                                                                                                                                              | $      | 54,021,355    |
|                                                                                                                                                        |      |   |   | Consumer Durables & Apparel - 5.3%                                                                                                                            |   |          |
|                                                                                                                                                        |      |   |   | Homebuilding - 1.5%                                                                                                                                               |   |          |
|                                                                                                                                                        | 446,220   |   |   | Toll Brothers, Inc. *                                                                                                                                             | $      | 16,590,460    |
|                                                                                                                                                        |      |   |   | Footwear - 3.8%                                                                                                                                                   |   |          |
|                                                                                                                                                        | 307,802   |   |   | NIKE, Inc. (Class B)                                                                                                                                              | $      | 40,716,049    |
|                                                                                                                                                        |      |   |   | Total Consumer Durables & Apparel                                                                                                                             | $      | 57,306,509    |
|                                                                                                                                                        |      |   |   | Consumer Services - 3.3%                                                                                                                                          |   |          |
|                                                                                                                                                        |      |   |   | Restaurants - 3.3%                                                                                                                                                |   |          |
|                                                                                                                                                        | 573,312   |   |   | Starbucks Corp.                                                                                                                                                   | $      | 35,195,624    |
|                                                                                                                                                        |      |   |   | Total Consumer Services                                                                                                                                           | $      | 35,195,624    |
|                                                                                                                                                        |      |   |   | Media - 2.7%                                                                                                                                                      |   |          |
|                                                                                                                                                        |      |   |   | Movies & Entertainment - 2.7%                                                                                                                                 |   |          |
|                                                                                                                                                        | 420,229   |   |   | Time Warner, Inc.                                                                                                                                                 | $      | 29,407,625    |
|                                                                                                                                                        |      |   |   | Total Media                                                                                                                                                       | $      | 29,407,625    |
|                                                                                                                                                        |      |   |   | Retailing - 8.1%                                                                                                                                                  |   |          |
|                                                                                                                                                        |      |   |   | Apparel Retail - 1.0%                                                                                                                                             |   |          |
|                                                                                                                                                        | 207,419   |   |   | Ross Stores, Inc.                                                                                                                                                 | $      | 10,787,862    |
|                                                                                                                                                        |      |   |   | Home Improvement Retail - 4.6%                                                                                                                                    |   |          |
|                                                                                                                                                        | 373,479   |   |   | The Home Depot, Inc.                                                                                                                                              | $      | 50,001,369    |
|                                                                                                                                                        |      |   |   | Automotive Retail - 2.5%                                                                                                                                          |   |          |
|                                                                                                                                                        | 100,897   |   |   | O'Reilly Automotive, Inc. *                                                                                                                                       | $      | 26,623,691    |
|                                                                                                                                                        |      |   |   | Total Retailing                                                                                                                                                   | $      | 87,412,922    |
|                                                                                                                                                        |      |   |   | Food & Staples Retailing - 1.4%                                                                                                                               |   |          |
|                                                                                                                                                        |      |   |   | Food Retail - 1.4%                                                                                                                                                |   |          |
|                                                                                                                                                        | 172,861   |   |   | Walgreens Boots Alliance, Inc.                                                                                                                                    | $      | 14,525,510    |
|                                                                                                                                                        |      |   |   | Total Food & Staples Retailing                                                                                                                                | $      | 14,525,510    |
|                                                                                                                                                        |      |   |   | Food, Beverage & Tobacco - 10.1%                                                                                                                              |   |          |
|                                                                                                                                                        |      |   |   | Soft Drinks - 5.4%                                                                                                                                                |   |          |
|                                                                                                                                                        | 474,966   |   |   | Coca-Cola Enterprises, Inc.                                                                                                                                       | $      | 23,890,790    |
|                                                                                                                                                        | 375,497   |   |   | Dr. Pepper Snapple Group, Inc.                                                                                                                                    |   | 33,700,856    |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              | $      | 57,591,646    |
|                                                                                                                                                        |      |   |   | Packaged Foods & Meats - 1.2%                                                                                                                                 |   |          |
|                                                                                                                                                        | 300,646   |   |   | Mondelez International, Inc.                                                                                                                                      | $      | 13,126,204    |
|                                                                                                                                                        |      |   |   | Tobacco - 3.5%                                                                                                                                                    |   |          |
|                                                                                                                                                        | 366,087   |   |   | Altria Group, Inc.                                                                                                                                                | $      | 21,086,611    |
|                                                                                                                                                        | 368,279   |   |   | Reynolds American, Inc.                                                                                                                                           |   | 17,032,904    |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              | $      | 38,119,515    |
|                                                                                                                                                        |      |   |   | Total Food, Beverage & Tobacco                                                                                                                                | $      | 108,837,365   |
|                                                                                                                                                        |      |   |   | Health Care Equipment & Services - 6.8%                                                                                                                       |   |          |
|                                                                                                                                                        |      |   |   | Health Care Equipment - 0.4%                                                                                                                                      |   |          |
|                                                                                                                                                        | 59,812    |   |   | Medtronic PLC                                                                                                                                                     | $      | 4,506,236     |
|                                                                                                                                                        |      |   |   | Health Care Distributors - 2.6%                                                                                                                                   |   |          |
|                                                                                                                                                        | 318,345   |   |   | Cardinal Health, Inc.                                                                                                                                             | $      | 27,648,263    |
|                                                                                                                                                        |      |   |   | Health Care Services - 1.8%                                                                                                                                       |   |          |
|                                                                                                                                                        | 224,183   |   |   | Express Scripts Holding Co. *                                                                                                                                     | $      | 19,163,163    |
|                                                                                                                                                        |      |   |   | Managed Health Care - 2.0%                                                                                                                                        |   |          |
|                                                                                                                                                        | 126,613   |   |   | Humana, Inc.                                                                                                                                                      | $      | 21,354,549    |
|                                                                                                                                                        |      |   |   | Total Health Care Equipment & Services                                                                                                                        | $      | 72,672,211    |
|                                                                                                                                                        |      |   |   | Pharmaceuticals, Biotechnology & Life Sciences - 12.2%                                                                                                        |   |          |
|                                                                                                                                                        |      |   |   | Biotechnology - 9.9%                                                                                                                                              |   |          |
|                                                                                                                                                        | 275,037   |   |   | AbbVie, Inc.                                                                                                                                                      | $      | 15,993,402    |
|                                                                                                                                                        | 148,461   |   |   | Alder Biopharmaceuticals, Inc.                                                                                                                                    |   | 5,531,657     |
|                                                                                                                                                        | 295,532   |   |   | Celgene Corp. *                                                                                                                                                   |   | 32,345,977    |
|                                                                                                                                                        | 496,765   |   |   | Gilead Sciences, Inc. *                                                                                                                                           |   | 52,637,219    |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              | $      | 106,508,255   |
|                                                                                                                                                        |      |   |   | Pharmaceuticals - 2.3%                                                                                                                                            |   |          |
|                                                                                                                                                        | 246,442   |   |   | Johnson & Johnson                                                                                                                                             | $      | 24,949,788    |
|                                                                                                                                                        |      |   |   | Total Pharmaceuticals, Biotechnology & Life Sciences                                                                                                          | $      | 131,458,043   |
|                                                                                                                                                        |      |   |   | Diversified Financials - 3.6%                                                                                                                                     |   |          |
|                                                                                                                                                        |      |   |   | Specialized Finance - 1.9%                                                                                                                                        |   |          |
|                                                                                                                                                        | 79,414    |   |   | Intercontinental Exchange, Inc.                                                                                                                                   | $      | 20,634,934    |
|                                                                                                                                                        |      |   |   | Investment Banking & Brokerage - 1.7%                                                                                                                         |   |          |
|                                                                                                                                                        | 526,833   |   |   | Morgan Stanley Co.                                                                                                                                                | $      | 18,070,372    |
|                                                                                                                                                        |      |   |   | Total Diversified Financials                                                                                                                                      | $      | 38,705,306    |
|                                                                                                                                                        |      |   |   | Software & Services - 21.8%                                                                                                                                   |   |          |
|                                                                                                                                                        |      |   |   | Internet Software & Services - 9.7%                                                                                                                           |   |          |
|                                                                                                                                                        | 41,666    |   |   | Alphabet, Inc.                                                                                                                                                    | $      | 31,784,908    |
|                                                                                                                                                        | 43,080    |   |   | Alphabet, Inc.                                                                                                                                                    |   | 31,991,208    |
|                                                                                                                                                        | 383,413   |   |   | Facebook, Inc. *                                                                                                                                                  |   | 39,966,971    |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              | $      | 103,743,087   |
|                                                                                                                                                        |      |   |   | IT Consulting & Other Services - 1.4%                                                                                                                         |   |          |
|                                                                                                                                                        | 237,241   |   |   | Cognizant Technology Solutions Corp. *                                                                                                                            | $      | 15,321,024    |
|                                                                                                                                                        |      |   |   | Data Processing & Outsourced Services - 5.2%                                                                                                                  |   |          |
|                                                                                                                                                        | 261,302   |   |   | PayPal Holdings, Inc.                                                                                                                                             | $      | 9,213,509     |
|                                                                                                                                                        | 591,520   |   |   | Visa, Inc.                                                                                                                                                        |   | 46,735,995    |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              | $      | 55,949,504    |
|                                                                                                                                                        |      |   |   | Systems Software - 5.5%                                                                                                                                           |   |          |
|                                                                                                                                                        | 1,094,088 |   |   | Microsoft Corp.                                                                                                                                                   | $      | 59,463,683    |
|                                                                                                                                                        |      |   |   | Total Software & Services                                                                                                                                     | $      | 234,477,298   |
|                                                                                                                                                        |      |   |   | Technology Hardware & Equipment - 5.5%                                                                                                                        |   |          |
|                                                                                                                                                        |      |   |   | Computer Storage & Peripherals - 5.5%                                                                                                                         |   |          |
|                                                                                                                                                        | 503,510   |   |   | Apple, Inc.                                                                                                                                                       | $      | 59,565,233    |
|                                                                                                                                                        |      |   |   | Total Technology Hardware & Equipment                                                                                                                         | $      | 59,565,233    |
|                                                                                                                                                        |      |   |   | Semiconductors & Semiconductor Equipment - 2.4%                                                                                                               |   |          |
|                                                                                                                                                        |      |   |   | Semiconductors - 2.4%                                                                                                                                             |   |          |
|                                                                                                                                                        | 1,138,986 |   |   | Taiwan Semiconductor Manufacturing Co., Ltd. (A.D.R.)                                                                                                             | $      | 25,923,321    |
|                                                                                                                                                        |      |   |   | Total Semiconductors & Semiconductor Equipment                                                                                                                | $      | 25,923,321    |
|                                                                                                                                                        |      |   |   | Telecommunication Services - 1.7%                                                                                                                                 |   |          |
|                                                                                                                                                        |      |   |   | Integrated Telecommunication Services - 1.7%                                                                                                                      |   |          |
|                                                                                                                                                        | 392,143   |   |   | Verizon Communications, Inc.                                                                                                                                      | $      | 17,822,899    |
|                                                                                                                                                        |      |   |   | Total Telecommunication Services                                                                                                                                  | $      | 17,822,899    |
|                                                                                                                                                        |      |   |   | TOTAL COMMON STOCKS                                                                                                                                               |   |          |
|                                                                                                                                                        |      |   |   | (Cost $806,565,251)                                                                                                                                               | $      | 1,061,901,687 |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        |      |   |   | TOTAL INVESTMENT IN SECURITIES - 98.7%                                                                                                                            |   |          |
|                                                                                                                                                        |      |   |   | (Cost $806,565,251) (a)                                                                                                                                           | $      | 1,061,901,687 |
|                                                                                                                                                        |      |   |   | OTHER ASSETS & LIABILITIES - 1.3%                                                                                                                             | $      | 14,392,559    |
|                                                                                                                                                        |      |   |   | TOTAL NET ASSETS - 100.0%                                                                                                                                         | $      | 1,076,294,246 |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        | *         |   |   | Non-income producing security.                                                                                                                                    |   |          |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        | (A.D.R.)  |   |   | American Depositary Receipts.                                                                                                                                     |   |          |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        | (a)       |   |   | At November 30, 2015, the net unrealized appreciation (depreciation) on investments based on cost for federal income tax purposes of $807,564,582 was as follows: |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        |      |   |   | Aggregate gross unrealized appreciation for all investments in which                                                                                              |   |          |
|                                                                                                                                                        |      |   |   | there is an excess of value over tax cost                                                                                                                         | $      | 260,152,750   |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        |      |   |   | Aggregate gross unrealized depreciation for all investments in which                                                                                              |   |          |
|                                                                                                                                                        |      |   |   | there is an excess of tax cost over value                                                                                                                         |   | (5,815,645)   |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
|                                                                                                                                                        |      |   |   | Net unrealized appreciation                                                                                                                                       | $      | 254,337,105   |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
| Various inputs are used in determining the value of the Fund's investments.  These inputs are summarized in the three broad levels listed below.  |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
| Level 1 – quoted prices in active markets for identical securities.                                                                                   |      |   |
| Level 2 – other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.). |
| Level 3 – significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments).                            |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |
| The following is a summary of the inputs used as of November 30, 2015, in valuing the Fund's investments:                                                   |      |   |
|                                                                                                                                                        |      |   |   |                                                                                                                                                              |   |          |

|                                                                                          |   | Level 1 |          |   | Level 2 |   |   | Level 3 |   |   | Total  |   |
|-----------------------------------------------------------------------------------------------|--------|---------|---------------|--------|---------|--------|--------|---------|--------|--------|--------|--------|
| Common Stocks                                                                                 |   | $       | 1,061,901,687 |   |    | $      | -      |    |   | $      | -      |   |   | $ | 1,061,901,687 |   |
| Total                                                                                         |   | $       | 1,061,901,687 |   |    | $      | -      |    |   | $      | -      |   |   | $ | 1,061,901,687 |   |
|                                                                                          |   |    |          |   |    |   |   |    |   |   |   |   |   |   |   |   |
| During the period ended November 30, 2015, there were no transfers between Levels 1, 2 and 3. |   |    |          |   |    |   |   |    |   |   |   |   |   |