Pitzer is a surname, and may refer to:
- Alexander White Pitzer (1834-1927), United States Presbyterian clergyman (see "Pitzer, Alexander White". Appletons' Cyclopædia of American Biography. 1900.)
- Kenneth Pitzer (1914–1997), American theoretical chemist
- Russell K. Pitzer (1878–1978), American businessman and philanthropist
- Russell M. Pitzer, American theoretical chemist
- William Bruce Pitzer (1917-1966), American Naval officer