McKellar is a surname. Notable people with the surname include:
Archibald McKellar (1816–1894), Canadian politicianArchie McKellar (1912–1940), Royal Air Force fighter pilot during the Battle of Britain in World War II.Colin McKellar (1903–1970), Australian farmer, soldier and federal politicianCrystal McKellar (born 1976), American actress and younger sister to DanicaDanica McKellar (born 1975), American actress and older sister to CrystalDaniel McKellar (1892–1917), Scottish footballerDon McKellar (born 1963), Canadian actor, writer, and filmmakerJohn McKellar (1833–1900), Canadian businessman and politicianJohn McKellar (writer) (1930–2010), Australian playwright, social satiristKenneth McKellar (politician) (1869–1957), American politicianKenneth McKellar (singer) (born 1927), Scottish singerEarl McKellar (1918–1976), Canadian politicianPhil McKellar, Australian record producer