Castellum, Inc.

3 Bethesda Metro Center, Suite 700

Bethesda, MD 20814

December 8, 2023

United States Securities and Exchange Commission

Division of Corporation Finance

Office of Trade & Services

100 F Street, N.E.

Washington, D.C. 20549

Re:	Castellum, Inc.
	Registration Statement on Form S-1 (File No. 333-275840)

Ladies and Gentlemen:

In accordance with Rule 461 of the Securities Act of 1933, as amended, Castellum, Inc. hereby respectfully requests that the effective date of the above-captioned Registration Statement be accelerated so that it will be declared effective at 5:00 p.m. Eastern Time on Tuesday, December 12, 2023, or as soon thereafter as possible.

Very Truly Yours,

CASTELLUM, INC.

/s/ Mark C. Fuller

Mark C. Fuller

Chief Executive Officer (Principal Executive Officer)