# EDGAR Filing Document

**Accession Number:** 0001306349
**File Stem:** 0001306349-23-000002
**Filing Date:** 2023-1
**Character Count:** 2657
**Document Hash:** cde3ff8f0660782465478a32a5705394
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001306349-23-000002.hdr.sgml**: 20230103

**ACCESSION NUMBER**: 0001306349-23-000002

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230103

**DATE AS OF CHANGE**: 20230103

**EFFECTIVENESS DATE**: 20230103

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Pioneer Series Trust III
- **CENTRAL INDEX KEY:** 0001306349
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0630

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-120144
- **FILM NUMBER:** 23501348

**BUSINESS ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** (617)742-7825

**MAIL ADDRESS:**
- **STREET 1:** 60 STATE STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109

## Series and Classes Contracts Data

### Pioneer Disciplined Value Fund (Series ID: S000010093)

| Class ID   | Class Name                              | Ticker Symbol   |
|:---|:---|:---|
| C000027968 | Pioneer Disciplined Value Fund: Class A | CVFCX           |
| C000027970 | Pioneer Disciplined Value Fund: Class C | CVCFX           |
| C000027971 | Pioneer Disciplined Value Fund: Class Y | CVFYX           |
| C000041565 | Pioneer Disciplined Value Fund: Class R | CVRFX           |
| C000199250 | Pioneer Disciplined Value Fund: Class K | CVKFX           |

```

[LOGO Amundi US]

January 3, 2023

VIA ELECTRONIC TRANSMISSION
---------------------------

Securities and Exchange Commission
Division of Investment Management
100 F Street, NE
Washington, DC  20549

Re:  Pioneer Series Trust III (the "Trust")
     (File Nos. 333-120144 and 811-21664)
     CIK No.  0001306349

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, we
certify that the form of prospectus and statement of additional information
relating to Pioneer Disciplined Value Fund, a series of the Trust, that
would have been filed under paragraph (c) of Rule 497, do not differ from
that contained in Post-Effective Amendment No. 29 to the Trust's registration
statement on Form N-1A, filed electronically with the Securities and Exchange
Commission on December 22, 2022 (SEC Accession No. 0001193125-22-310888).

If you have any questions or comments concerning the foregoing certification,
please contact me at (617) 422-4695.

Very truly yours,

/s/ Thomas Reyes
    ---------------------
    Thomas Reyes
    Assistant Secretary

cc:  Christopher J. Kelley, Esq.
     Jeremy B. Kantrowitz, Esq.

Amundi Asset Management US, Inc.
60 State Street
Boston, MA  02109-1820

```