Garretson is a surname. Notable people with the surname include:
Austin B. Garretson (1856–1931), an American labor leader who became president of the Order of Railway Conductors.
Bob Garretson (born 1933), American racing driver
Darell Garretson (1932–2008), American basketball referee
John Wesley Garretson (1812-1895), a surveyor who mapped large areas of Askansas and New Mexico
Katy Garretson, American television director
Mary Welleck Garretson (1896-1971), American geologist and paleontologist
Ron Garretson (born 1958), American professional basketball referee
