Ungar is a surname. Notable people with the surname include:
Benjamin (Benji) Ungar (1986–), an American Épée fencer
David Ungar, an American engineer
Hermann Ungar (1893–1929), a Bohemian writer of German language and an officer in the Ministry of Foreign Affairs of Czechoslovakia Jay Ungar (1946–), an American fiddler and composer Ruth Ungar (1976–) usually known as Ruthy, American multi-instrumentalist and singer. Member of The Mammals and daughter of Jay Ungar Sanford J. Ungar (1945–), an American journalist and former president of Goucher College Shmuel Dovid Ungar (1886–1945), Rav of Nitra, Slovakia Shmueli Ungar, American singer Simon Ungar (1864–1942), rabbi of the Osijek Jewish Community Stu Ungar (1953–1998), a professional poker and gin rummy player William Ungar (1913–2013), founder of the National Envelope Corporation