Donald James Cock (10 July 1896 – 31 August 1974) was an English football player. He was the younger brother of England international Jack Cock and his other brother Herbert was also a footballer.Born in Hayle, Cornwall, Cock started his professional career with Brentford during World War I. A striker, he moved to Fulham in 1919. In three seasons with the Second Division club, he averaged a goal every other game, and was the club's leading goalscorer in 1919–20 and 1920–21.