Lee M. Spetner (Hebrew: לי ספטנר; January 17, 1927 – August 9, 2024) was an American and Israeli creationist author, mechanical engineer, applied biophysicist, and physicist, known best for his disagreements with the modern synthesis.

[3] Spetner continued to study at the Applied Physics Laboratory at Johns Hopkins University from 1951 to 1970, working on guided-missile systems.

Spetner was inspired by Rabbi David Luria (1798–1855), who calculated that, according to Talmudic sources, there were 365 originally created species of beasts and 365 of birds.

[10][11] Spetner's critical stance on the plausibility of the evolutionary theory of the appearance of beneficial mutations was supported by the Australian statistician Professor Michael Hasofer.

[15] Additionally, Spetner vehemently rejected the teaching of Creation in public schools, asserting that "the subject is best handled in the home or within a religious environment.