Sir John Frederick Eustace Stephenson PC (28 March 1910 – 1 November 1998) was an English barrister and judge, a Lord Justice of Appeal from 1971 until his retirement in 1985 and a member of the Privy Council. As a Judge of the Court of Appeal he was known as Lord Justice Stephenson.
The second son of Sir Guy Stephenson CB, by his marriage to Gwendolen Talbot, a daughter of John Gilbert Talbot PC MP, Stephenson was a grandson of Sir Augustus Frederick William Keppel Stephenson (1827–1904) a Treasury Solicitor and Director of Public Prosecutions. He had two sisters, Margaret Eglantine (born 1907) and Jane (1914) and three brothers, Augustus (1909), Paul (1913) and H. J. Stephenson (1921–1943).
He was educated at West Downs,Winchester College and New College, Oxford, holding scholarships at both. He took a first in Honours Moderations in 1930 and another in Literae Humaniores in 1932, graduating BA in 1932. His father died in 1930 while he was still an undergraduate at Oxford.
Stephenson was called to the Bar from the Inner Temple in 1934. In 1938 he joined the Royal Engineers (Territorial Army) as a Sapper. In 1940 he was attached to the War Office and was commissioned into the Intelligence Corps, in which he was a Captain in 1943, promoted Major in 1944 and Lieutenant-Colonel in 1946, serving in the Middle East and North West Europe. In 1946 he was appointed as Regional Intelligence Officer in Hamburg.