Ralph Sheldon Mansfield, 4th Baron Sandhurst, OBE (19 July 1892 - 1964) was the son of John William Mansfield, 3rd Baron Sandhurst. Mansfield became 4th Baron Sandhurst upon the death of his father, John William Mansfield, the 3rd Baron Sandhurst, in 1933.
He was educated at Winchester College and Trinity College, Cambridge.
During World War I he served with the Royal Engineers Signal Service, and was made OBE in 1918. In 1939 he was commissioned as a Major in the Royal Corps of Signals in 1939 and worked for MI8.
He married Morley Victoria Upcher (died 17 June 1961), daughter of Edward Berners Upcher, on 8 February 1917. They had three children:
| Escutcheon: | Argent on a chevron embattled Azure between three maunches Sable an Eastern crown Or on a chief engrailed of the third a lion of the fourth combatant with a tiger cowed Proper. |
| Crest: | Out of an Eastern crown Argent a gryphon’s head Sable beaked Or between two branches of laurel Proper. |
| Motto: | Steadfast [1] |