Osterman is a surname. Notable people with the surname include:
Russian
- Andrei Osterman (1686–1747), Russian statesman
- Ivan Osterman (1725-1811), Russian statesman
American
- Cat Osterman (b. 1983), American softball player
- Harry Osterman, Chicago politician
- Kathryn Osterman (1883-1956), American actress
- Lynne Osterman (b. 1962), American politician from Minnesota
- J.P. Osterman, American writer of science fiction
Slovene
- Ana Osterman (born 1940), Slovene politician
Swedish
- Oscar Osterman (1894–1956), Swedish Army officer
Fictional characters
[edit]- Jon Osterman, a character in the Watchmen series, known more commonly as Doctor Manhattan