DOMINI SOCIAL INVESTMENTS LLC
                            536 BROADWAY, 7TH FLOOR
                            NEW YORK, NY 10012-3915



September 29, 2004


VIA EDGAR

Securities and Exchange Commission
Division of Investment Management
Judiciary Plaza
450 Fifth Street, N.W.
Washington, DC  20549

Re:     Domini Social Investment Trust
        File Nos. 33-29180 and 811-5823

Ladies and Gentlemen:

On behalf of Domini Social Investment Trust, a Massachusetts business trust (the
"Trust"), we enclose for filing Post-Effective Amendment No. 25 to the Trust's
Registration Statement on Form N-1A under the Securities Act of 1933 and
Amendment No. 27 to the Trusts Registration Statement under the Investment
Company Act of 1940, with exhibits (the "Amendment"). The Amendment relates to
Domini Social Equity Fund and Domini Social Bond Fund (collectively, the
"Funds"), each a series of the Trust.

The Amendment is being filed pursuant to Rule 485(a)(1) under the Securities Act
of 1933, and is to be effective on November 30, 2004. The Amendment is being
filed to: (i) institute a 2% redemption fee on sales or exchanges of Class R
shares made less than 90 days after settlement of purchase or acquisition
through exchange, with certain exceptions; (ii) comply with recently effected
amendments to Form N-1A requiring disclosure of the Funds' policies and
procedures relating to marketing timing and the disclosure of the Funds'
portfolio holdings; and (iii) update other information relating to the Funds.

Please call the undersigned at (212) 217-1071 with any questions relating to the
filing.

Sincerely,

Elizabeth L. Belanger
Director of Compliance