Gerretsen, Gerrets and Gerretse are Dutch patronymic surnames. Notable people with this name include:

• Boris Gerrets (1948–2020), Dutch-born film director

• Chas Gerretsen (born 1943), Dutch photojournalist

• John Gerretsen (born 1942), Canadian politician

• Mark Gerretsen (born 1975), Canadian politician

• Wolphert Gerretse van Kouwenhoven (1579–1662), Dutch settler in New Netherland known by his patronym Gerretse

See also

• Gerritsen

• Gerritszoon