Charles Weissmann (born 14 October 1931) is a Hungarian-Swiss molecular biologist.

Weissmann went to University of Zurich and obtained his MD in 1956 and Ph.D. in Organic Chemistry in 1961.

Weissmann was director of the Institute for Molecular Biology in Zurich, President of the Roche Research Foundation and co-founder and Member of the Scientific Council of Biogen.

A member of the American Society of Biological Chemistry and the Deutsche Akademie der Naturforscher Leopoldina he is also a Foreign Associate of the U.S. National Academy of Sciences, the Royal Society (UK) and the Pour le Mérite (Germany).

On 16 May 2011 Weissmann became Doctor of Science Honoris Causa at New York University.