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



                                          FORM 10-K


  (Mark one)

  /X/ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934
      For the fiscal year ended December 31, 2004

      OR



  / / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934


      Commission File Number:  333-112231-18


        Merrill Lynch Mortgage Investors, Inc.
        Mortgage Pass-Through Certificates
        Series 2004-A03

     (Exact name of registrant as specified in its charter)


   New York                                         54-6636563
  (State or other jurisdiction of                   54-6636564
  incorporation or organization)                    (I.R.S. Employer
                                                    Identification No.)


   c/o Wells Fargo Bank, N.A.
   9062 Old Annapolis Road
   Columbia, Maryland                                21045
  (Address of principal executive offices)     (Zip Code)


  Registrant's telephone number, including area code: (410) 884-2000


  Securities registered pursuant to Section 12(b) of the Act:

        NONE.


  Securities registered pursuant to Section 12(g) of the Act:

        NONE.


  Indicate by check mark whether the registrant (1) has filed all reports
  required to be filed by Section 13 or 15(d) of the Securities Exchange
  Act of 1934 during the preceding 12 months (or for such shorter period
  that the registrant was required to file such reports), and (2) has been
  subject to such filing requirements for the past 90 days.

        Yes  X       No ___


  Indicate by check mark if disclosure of delinquent filers pursuant to
  Item 405 of Regulation S-K ( 229.405 of this chapter) is not contained
  herein, and will not be contained, to the best of registrant's knowledge,
  in definitive proxy or information statements incorporated by reference
  in Part III of this Form 10-K or any amendment to this Form 10-K.

        Not applicable.


  Indicate by check mark whether the registrant is an accelerated filer
  (as defined in Exchange Act Rule 12b-2).

        Yes  ___     No  X


  State the aggregate market value of the voting and non-voting common
  equity held by non-affiliates computed by reference to the price at which
  the common equity was last sold, or the average bid and asked price of
  such common equity, as of the last business day of the registrant's most
  recently completed second fiscal quarter.

        Not applicable.


  Indicate the number of shares outstanding of each of the registrant's
  classes of common stock, as of the latest practicable date.

        Not applicable.


     Documents Incorporated by Reference

  List hereunder the following documents if incorporated by reference and
  the Part of the Form 10-K (e.g. Part I, Part II, etc.) into which the
  document is incorporated: (1)Any annual report to security holders; (2)
  Any proxy or information statement; and (3)Any prospectus filed pursuant
  to Rule 424(b) or (c) under the Securities Act of 1933. The listed
  documents should be clearly described for identification purposes (e.g.
  annual report to security holders for fiscal year ended December 24, 1980).

        Not applicable.


                                   PART I

  Item 1.  Business.

            Omitted.

  Item 2.  Properties.

            See Item 15(a), Exhibits 99.1, 99.2, and 99.3, for information
            provided in lieu of information required by Item 102 of
            Regulation S-K.


  Item 3.  Legal Proceedings.

            The registrant knows of no material pending legal proceedings
            involving the trust created under the Pooling and Servicing
            Agreement (the Trust), the Trustee, the Servicer or the
            registrant with respect to the Trust other than routine
            litigation incidental to the duties of the respective parties.


  Item 4.  Submission of Matters to a Vote of Security Holders.

            None.


                                PART II

  Item 5.  Market for registrant's Common Equity and Related Stockholder
           Matters and Issuer Purchases of Equity Securities.

            No established public trading market for the Certificates exists.

            Records provided to the Trust by the DTC and the Trustee
            indicate that as of December 31, 2004, the total number of holders
            of record for the Series of Certificates is 17.


  Item 6.  Selected Financial Data.

            Omitted.


  Item 7.  Management's Discussion and Analysis of Financial Condition and
           Results of Operation.

            Omitted.


  Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

            Not applicable.


  Item 8.  Financial Statements and Supplementary Data.

            See Item 15(a), Exhibits 99.1, 99.2, 99.3, for information
            provided in lieu of information required by Item 302 of
            Regulation S-K.


  Item 9.  Changes in and Disagreements with Accountants on Accounting and
           Financial Disclosure.

            None.


  Item 9A. Controls and Procedures.

            Not applicable.


  Item 9B. Other Information.

            None.


                                PART III

  Item 10. Directors and Executive Officers of the Registrant.

            Not applicable.


  Item 11. Executive Compensation.

            Not applicable.


  Item 12. Security Ownership of Certain Beneficial Owners and Management.

            Not applicable.

  Item 13. Certain Relationships and Related Transactions.

            Not applicable.


  Item 14. Principal Accounting Fees and Services.

            Not applicable.


                                PART IV

  Item 15. Exhibits, Financial Statement Schedules.

   (a) Exhibits

     (31.1) Rule 13a-14(a)/15d-14(a) Certification

     (99.1) Annual Independent Accountants' Servicing Reports concerning
            servicing activities.

      <TABLE>

      
         <c>
      a) Countrywide Home Loans Inc., as Servicer <F1>

      </TABLE>

     (99.2) Report of Management as to Compliance with Minimum Servicing
            Standards.

      <TABLE>

      
        <c>
      a) Countrywide Home Loans Inc., as Servicer <F1>

      </TABLE>

     (99.3) Annual Statements of Compliance under the Pooling and Servicing
            Agreements.

      <TABLE>

      
         <c>
      a) Countrywide Home Loans Inc., as Servicer <F1>

      </TABLE>


     (99.4) Aggregate Statement of Principal and Interest Distributions to
            Certificate Holders.


   (b) Not applicable.

   (c) Omitted.


  <F1> Filed herewith.


                                SIGNATURES

  Pursuant to the requirements of Section 13 or 15(d) of the Securities
  Exchange Act of 1934, the registrant has duly caused this report to be
  signed on its behalf by the undersigned, thereunto duly authorized:



    Merrill Lynch Mortgage Investors, Inc.
    Mortgage Pass-Through Certificates
    Series 2004-A03
    (Registrant)


  Signed: Wells Fargo Bank, N.A. as Master Servicer

  By:     Robert Patelunas, Vice President

  By: /s/ Robert Patelunas, Vice President

  Dated:   March 29, 2005


  SUPPLEMENTAL INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO
  SECTION 15(d) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED
  SECURITIES PURSUANT TO SECTION 12 OF THE ACT.


  (a)(i) No annual report is provided to the Certificateholders other than
  with respect to aggregate principal and interest distributions.


  (a)(ii) No proxy statement, form of proxy or other proxy soliciting
  material has been sent to any Certificateholder with respect to any
  annual or other meeting of Certificateholders.



  Exhibit Index

  Exhibit No.

  Ex-31.1 Rule 13a-14(a)/15d-14(a) Certification

  Re: Merrill Lynch Mortgage Investors, Inc

  Mortgage Pass-Through Certificates, Series 2004-A3

  I, Robert Patelunas, certify that:

  1. I have reviewed this annual report on Form 10-K, and all reports on
     Form 8-K containing distribution or servicing reports filed in
     respect of periods included in the year covered by this annual report
     of Merrill Lynch Mortgage Investors, Inc. (the "Registrant");

  2. Based on my knowledge, the information in these reports, taken as a
     whole, does not contain any untrue statement of a material fact or
     omit to state a material fact necessary to make the statements made,
     in light of the circumstances under which such statements were made,
     not misleading as of the last day of the period covered by this
     annual report;

  3. Based on my knowledge, the servicing information required to be
     provided to the Trustee by the Master Servicer under the Pooling and
     Servicing Agreement for inclusion in these reports is included in
     these reports;

  4. I am responsible for reviewing the activities performed by the
     Servicer under the Servicing Agreement and based upon my knowledge
     and the annual compliance review required under the Servicing
     Agreement, and except as disclosed in the reports, the Servicer has
     fulfilled its obligations under the Servicing Agreement; and

  5. The reports disclose all significant deficiencies relating to the
     Servicer's compliance with the minimum servicing standards based upon
     the report provided by an independent public accountant, after
     conducting a review in compliance with the Uniform Single Attestation
     Program for Mortgage Bankers or similar standard as set forth in the
     Servicing  Agreement that is included in these reports.

     In giving the certifications above, I have reasonably relied on
     information provided to me by the following unaffiliated parties:
     Countrywide Home Loans Inc. as Servicer.

     Capitalized terms used but not defined herein have the meanings
     ascribed to them in Pooling and Servicing Agreement, dated August 1,
     2004, among Merrill Lynch Mortgage Investors, Inc., as depositor,
     Wells Fargo Bank, National Association, as master servicer and
     securities administrator and Wachovia Bank, National Association, as
     trustee.

     Date:   March 29, 2005

     /s/ Robert Patelunas
     Signature

     Vice President
     Title


  EX-99.1
(logo) KPMG

KPMG LLP
Suite 2000
355 South Grand Avenue
Los Angeles, CA 90071-1568





Independent Accountants' Report




The Board of Directors
Countrywide Financial Corporation:



We have examined the accompanying management's assertion, that Countrywide
Financial Corporation and subsidiaries, including its wholly-owned subsidiary
Countrywide Home Loans, Inc. (CHL) and Countrywide Home Loans Servicing, L.P., a
wholly-owned subsidiary of CHL, (collectively, the Company) complied with the
minimum servicing standards set forth in the Mortgage Bankers Association of
America's Uniform Single Attestation Program for Mortgage Bankers (USAP) as of
and for the year ended December 31, 2004. Management is responsible for the
Company's compliance with those minimum servicing standards. Our responsibility
is to express an opinion on management's assertion about the Company's
compliance based on our examination.

Our examination was conducted in accordance with attestation standards
established by the American Institute of Certified Public Accountants and,
accordingly, included examining, on a test basis, evidence about the Company's
compliance with the minimum servicing standards specified above and performing
such other procedures as we considered necessary in the circumstances. We
believe that our examination provides a reasonable basis for our opinion. Our
examination does not provide a legal determination on the Company's compliance
with the minimum servicing standards.

In our opinion, management's assertion that Countrywide Financial Corporation
and subsidiaries, including its wholly-owned subsidiary Countrywide Home Loans,
Inc. (CHL) and Countrywide Home Loans Servicing, L.P., a wholly-owned subsidiary
of CHL, complied with the aforementioned minimum servicing standards as of and
for the year ended December 31, 2004 is fairly stated, in all material respects.

/s/ KPMG LLP

March 17, 2005





KPMG LLP, a U.S. limited liability partnership, is the U.S.
member firm of KPMG International, a Swiss cooperative.





  EX-99.2
(logo) Countrywide
HOME LOANS

2900 MADERA ROAD
SUN VALLEY, CALIFORNIA 93065-6298
(805) 955-1000


Management's Assertion


March 17, 2005

As of and for the year ended December 31, 2004, Countrywide Financial
Corporation and Subsidiaries (which includes its wholly-owned subsidiary,
Countrywide Home Loans, Inc. ("CHL"), and Countrywide Home Loans Servicing,
L.P., a wholly owned subsidiary of CHL) ("the Company") has complied in all
material respects with the minimum servicing standards set forth in the
Mortgage Bankers Association of America's Uniform Single Attestation for
Mortgage Bankers. As of and for this same period, the Company had in effect a
fidelity bond and errors and omissions policy in the amount of $200 million and
$100 million, respectively.




/s/ Thomas K. McLaughlin
Thomas K. McLaughlin
Executive Managing Director and
Chief Financial Officer



/s/ Kevin Meyers
Kevin Meyers
Managing Director, Chief Financial Officer
Loan Administration





  EX-99.3
Exhibit "A"

Wells Fargo Bank Minnesota, N.A.
9062 Old Annapolis Rd.
Columbia, MD 21045
Attention: Master Servicing

RE: Officer's Certificate

Dear Master Servicer:

The undersigned Officer certifies the following for the 2004 fiscal year:


(A) I have reviewed the activities and performance of the Servicer during the
preceding fiscal year under the terms of the Servicing Agreement, Trust
Agreement, Pooling and Servicing Agreement and/or Seller/Servicer Guide and to
the best of these Officers' knowledge, the Servicer has fulfilled all of its
duties, responsibilities or obligations under these Agreements throughout such
year, or if there has been a default or failure of the servicer to perform any
of such duties, responsibilities or obligations, a description of each default
or failure and the nature and status thereof has been reported to Wells Fargo
Bank Minnesota, N.A.;

(B) I have confirmed that the Servicer is currently an approved FNMA or FHLMC
servicer in good standing;

(C) I have confirmed that the Fidelity Bond, the Errors and Omissions Insurance
Policy and any other bonds required under the terms of the Servicing Agreement,
Trust Agreement, Pooling and Servicing Agreement and/or Seller/Servicer Guide
are in full force and effect;

(D) All premiums for each Hazard Insurance Policy, Flood Insurance Policy (if
applicable) and Primary Mortgage Insurance Policy (if applicable), with respect
to each Mortgaged Property, have been paid and that all such insurance policies
are in full force and effect;

(E) All real estate taxes, governmental assessments and any other expenses
accrued and due, that if not paid could result in a lien or encumbrance on any
Mortgaged Property, have been paid, or if any such costs or expenses have not
been paid with respect to any Mortgaged Property, the reason for the non-payment
has been reported to Wells Fargo Bank Minnesota, N.A.;

(F) All Custodial Accounts have been reconciled and are properly funded; and

(G) All annual reports of Foreclosure and Abandonment of Mortgage Property
required per section 6050H, 6050J and 6050P of the Internal Revenue Code,
respectively, have been prepared and filed.

Certified By: /s/ Countrywide

/s/ Joseph Candelario
Officer

First Vice President
Title

/s/ 3/21/05
Date





  Ex-99.4

   Schedule of Year-To-Date Principal and Interest Distributions to
   Certificateholders


   <TABLE>

   Class                              Interest             Principal               Losses             Ending Balance
   
                       <c>                    <c>                  <c>                 <c>
   B-1                               18,007.16              2,398.86                 0.00               1,162,601.14
   B-2                               18,007.16              2,398.86                 0.00               1,162,601.14
   B-3                               12,027.41              1,602.27                 0.00                 776,528.74
   I-A                            1,511,820.12         11,007,385.24                 0.00             103,687,614.76
   II-A                             562,819.05          6,914,686.42                 0.00              31,074,313.58
   III-A-1                        1,565,595.69          5,115,102.96                 0.00              94,884,897.05
   III-A-2                          458,437.73          1,497,804.44                 0.00              27,784,195.55
   III-A-3                           15,890.79             51,918.30                 0.00                 963,081.71
   IV-A-1                           663,147.88          1,518,723.67                 0.00              38,481,276.32
   IV-A-2                            25,121.85             57,533.39                 0.00               1,457,775.61
   IV-A-3                           823,425.60          1,885,787.46                 0.00              47,781,903.54
   M-1                              102,045.71             13,594.26                 0.00               6,588,405.75
   M-2                               42,011.55              5,596.67                 0.00               2,712,403.34
   M-3                               27,018.47              3,599.32                 0.00               1,744,400.67
   R-I                                    0.00                  0.00                 0.00                       0.00
   R-II                                   0.00                  0.00                 0.00                       0.00
   </TABLE>