Ottomar is a masculine given name of Germanic origin.
The name may refer fo:
Ottomar Anschütz (1846–1907), German inventor, photographer, and chronophotographer
Ottomar Gern (1827–1882), Russian fortification engineer
Ottomar Rodolphe Vlad Dracula Prince Kretzulesco (1940–1007), German socialite
Ottomar Ladva (born 1997), Estonian chess player
Ottomar von Mayenburg (1865–1932), German pharmacist
Ottomar Pinto (1931–2007), Brazilian politician
Ottomar Rosenbach (1851–1907), German physician
Hermann Ottomar Herzog (1832–1932), German-American painter
Julius Rudolph Ottomar Freiherr von Minutoli (1804–1860), Prussian chief of police, diplomat, scientist, and author