Koll is a surname. Notable people with the surname include:
Adi Koll (born 1976), Israeli politician
Bill Koll (1923–2003), American sport wrestler
Claudia Koll (born 1965), Italian actress
Dominik Koll (born 1984), Austrian swimmer
Heinz Koll, Namibian rugby union player
Manuel Koll (born 1987), Austrian figure skater
Richard Koll (1897–1963), German Wehrmacht general
Rob Koll, American sport wrestler and coach