Hagar is both a feminine given name and a surname. Notable people with the name include:
Given name:
Hagar Badran (born 1989), Egyptian synchronized swimmer
Hagar Finer (b. 1984), Israeli WIBF bantamweight champion
Hagar Olsson (1893–1978), Finnish writer, literary critic, playwright and translator
Hagar Wilde (1905–1971), American writer and screenwriter
Hagar Yanai (born 1972), Israeli writer
Surname:
Albert Hagar (1827-1924), Canadian politician
Mandy Hagar (b. 1960), New Zealand children's author
Regan Hagar, drummer with Malfunkshun
Sammy Hagar (b. 1947), rock musician