John Sloan is the name of:
- John Sloan (businessman) (c. 1906 – 1988), U.S. businessman
- John Sloan Jr. (c. 1936 – 1991), U.S. banking executive
- John Sloan (medium), Scottish spiritualist active c. 1920
- John French Sloan (1871–1951), U.S. artist
- John McKee Sloan (born 1955), U.S. Episcopal bishop
- John Sloan, namesake of Sloan Lake in Hubbard County, Minnesota, U.S.