Leonid Iosifovich Vainerman (Ukrainian: Леонiд Йосипович Вайнерман; Russian: Леонид Иосифович Вайнерман; alternative spelling: Leonid Iosifovich Vajnerman; born November 15, 1946, in Kyiv, Ukraine) is a Ukrainian and French mathematician, professor emeritus at University of Caen Normandy.

[4][5] Vainerman studied mathematics at the Taras Shevchenko National University of Kyiv and graduated in 1969.

According to the French mathematician Alain Connes,[4] The theory of Kac algebras and their duality, [was] elaborated independently by M. Enock and J.

The subject has now reached a state of maturityThe two teams independently developed a general Pontryagin duality theory for all locally compact groups.

The contributions of both teams are covered in the 1992 book by Michel Enock and Jean-Marie Schwartz on Kac algebras.