Paul Lorenzen (March 24, 1915 – October 1, 1994) was a German philosopher and mathematician, founder of the Erlangen School (with Wilhelm Kamlah) and inventor of game semantics (with Kuno Lorenz).

Lorenzen studied at the University of Göttingen until he earned his PhD there in 1938 under Helmut Hasse with a thesis titled Zur Abstrakten Begründung der multiplikativen Idealtheorie.

In 1933, he joined the SA and the German Nazionalist Studenti Union (NSDStB), while, four years later, he became a member of the Nazi Party.

[2] Through Hasse's mediation, Lorenzen worked with Wilhelm Tranow from July 1940 to April 1941 on the Bavy's decoding project.

He wrote with Wilhelm Kamlah the famous book Logical Propaedeutic ("Logische Propädeutik") and worked on game semantics (Dialogische Logik) with Kuno Lorenz.