The South African Naval Ensign is a naval ensign used by ships of the South African Navy. A variant of the White Ensign, it features a green St George's Cross with the South African flag in the canton. South Africa has since 1922 had a variety of naval ensigns which have evolved into the current ensign adopted in 1994.

The White Ensign, at one time called the St George's Ensign because of the simultaneous existence of a crossless version of the flag, is an ensign worn on British Royal Navy ships and shore establishments. It consists of a red St George's Cross on a white field, identical to the flag of England except with the Union Flag in the upper canton.