Ralph Mansfield, 4th Baron Sandhurst

Ralph Sheldon Mansfield, 4th Baron Sandhurst, OBE (19 July 1892 – 1964) was an English nobleman.

Mansfield became 4th Baron Sandhurst upon the death of his father, John William Mansfield, the 3rd Baron Sandhurst, in 1933.

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.