Adar is a surname. Notable people with the surname include:
Jimmy Adar (born 1987), Ugandan middle-distance runner Tamar Adar (1939–2008), Israeli writer Yasemin Adar (born 1991), Turkish female freestyle wrestler
Fictional characters: President Adar, character in the original Battlestar Galactica Richard Adar, character in the reimagined Battlestar Galactica