Gaul is a surname. Notable people with the surname include:
Alfred R. Gaul (1837–1913), English composer and conductor
Arrah Lee Gaul (1888-1980), American painter
August Gaul (1869–1922), German sculptor
Charly Gaul (1932–2005), Luxembourgish cyclist
David Gaul (1886–1962), American swimmer and 1904 Olympian
Frank Gaul (born 1924), American politician
Gilbert Gaul (artist) (1855–1919), American war artist
Gilbert M. Gaul (born 1951), American journalist
Harvey Bartlett Gaul (1881–1945), American composer
Horace Gaul (1883–1939), ice hockey player
Karl Gaul (1889–1972), German politician
Michael Gaul (born 1973), former professional ice hockey defenceman
William Gaul (1850–1927), Bishop of Mashonaland