A variant of the White Ensign, it features a green St George's Cross with the South African flag in the canton.

On 15 May 1951, Director-General of Naval Forces Commodore Frederick Dean OBE recommended a new ensign:[2]the national flag of the Union of South Africa with an upper hoist canton consisting of three equally wide horizontal stripes from top to bottom or orange, white and blue.

The white stripe of the canton charged with a lion passant guardant Gules, supporting with the dexter paw four staves erect, alternatively Argent and Azure and banded Or, from the crest of the Coat of Arms of the Union of South AfricaIt appears to have not found favour in naval circles and was, as such, never flown.

[2] In 1952, a third ensign heralded a return to the British tradition, featuring a dark green cross with the national flag in the canton.

[2] On 5 March 1981, the proportions of the ensign were changed to 2:3 and the naval badge (featuring the crest of the South African coat of arms on a dark blue representation of the layout of the Castle of Good Hope) was added to the lower quarter.