Pitzer is a surname, and may refer to:
Alexander White Pitzer (1834–1927), American Presbyterian clergyman Gys Pitzer (1939–2025), South African rugby union player Kenneth Sanborn Pitzer (1914–1997), American theoretical chemist Russell Kelly Pitzer (1878–1978), American businessman and philanthropist Russell Mosher Pitzer (1938–), American theoretical chemist William Bruce Pitzer (1917–1966), American Naval officer
See also Pitzer College, liberal arts college located in Claremont, California, United States, named after Russell K. Pitzer Pitzer equations, thermodynamic equations named after Kenneth S. Pitzer