May 24, 2011
Securities and Exchange Commission
100 F Street, NE
Washington, DC 20549
RE: Calvert Social Index Series, Inc. (“Registrant”)
File Numbers 333-34122 and 811-09877
Withdrawal of a Registration Withdrawal Request
(Accession No. 0001105446-11-000020)
Filed May 23, 2011
Ladies and Gentlemen:
Registrant hereby requests withdrawal of the above-referenced registration withdrawal request. The Form RW was filed in error. A proper withdrawal of amendment to a registration statement, the Form AW, will be filed.
Please feel free to contact me at 301-657-7045 with any questions.
Sincerely,
/s/ Lancelot A. King
Lancelot A. King
Assistant Vice President
Associate General Counsel