Otomar is a Czech and Slovak masculine given name. Notable people with the name include:
Otomar Hájek (1930–2016), Czech-American mathematician Otomar Korbelář (1899–1976), Czech actor Otomar Krejča (1921–2009), Czech theatre director and anti-Communist dissident Otomar Kubala (1906–1946), Slovak fascist Otomar Kvěch (1950–2018), Czech composer