Ungar is a surname. Notable people with the surname include:
Benjamin (Benji) Ungar, 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, an American musician and composer
Shmuel Dovid Ungar (1886 – 1945), Rav of Nitra, Slovakia
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
