Pavel Winternitz (July 25, 1936 – February 13, 2021) was a Czech-born Canadian mathematical physicist.

Winternitz was a member of the Mathematical Physics group at the Centre de recherches mathématiques (CRM), a national research centre in mathematics at the Université de Montréal and Professor in the Department of Mathematics and Statistics at Université de Montréal.

His work has had a strong impact in several domains of mathematical physics, and his publications are very widely cited.

In 2001, he was recipient of the CAP-CRM Prize in Theoretical and Mathematical Physics .

Winternitz died in Montreal on February 13, 2021, at the age of 84.