Abraham Lewis Kaminstein (May 13, 1912, New York City, New York—September 10, 1977) was the sixth United States Register of Copyrights.

He first entered the role in an acting capacity after the death of his predecessor, Arthur Fisher, in November 1960.

The Librarian of Congress, L. Quincy Mumford, officially appointed him on December 24, 1960, and he served until August 31, 1971, when he resigned due to poor health and was succeeded by George D.

He continued his education at Harvard Law School, where he received an LLB in 1935 and an LLM in 1936.

Kaminstein began his career in government service in 1937, working as an attorney across various agencies before joining the Copyright Office.