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 Jon Osterman, a character in the Watchmen series, known more commonly as Doctor Manhattan
See also The Osterman Weekend, a novel The Osterman Weekend (film) Ostermann Eastman (surname)