Andrzej Grzegorczyk ([ˈandʐɛj ɡʐɛˈɡɔrt͡ʂɨk]; 22 August 1922 – 20 March 2014) was a Polish logician, mathematician, philosopher and ethicist.

He was noted for his work in computability, mathematical logic and the foundations of mathematics.

In 1953, Grzegorczyk married Renata Maria Grzegorczykowa, a Polish philologist and expert in polonist linguistics.

Grzegorczyk died of natural causes in Warsaw on 20 March 2014 at the age of 91.

His body is buried in the Cemetery of Pruszków.