Kellar is a German surname. Notable people with the surname include:
Becky Kellar-Duke (born 1975), Canadian ice hockey player George C. Kellar (1879–1954), American politician Harry Kellar (1849–1922), American magician (born "Heinrich Keller") Mark Kellar (1952–2023), American football player Scott Kellar (born 1963), American football player
See also McKellar