Martin Kneser (21 January 1928 – 16 February 2004) was a German mathematician.

He obtained his PhD in 1950 from Humboldt University of Berlin with the dissertation: Über den Rand von Parallelkörpern.

He also gave a simplified proof of the Fundamental theorem of algebra.

Kneser was an Invited Speaker of the ICM in 1962 at Stockholm.

[1] His main publications were on quadratic forms and algebraic groups.