Diana Mason, OBE[1][2] (29 April 1933 – 29 March 2016) was a British equestrian.

[3] In 1954, Mason became the first woman to be selected for the British three day eventing team.

[4] At the 1976 Summer Olympics in Montreal, she competed in the individual and team dressage events, finishing in 25th and 8th places respectively.

[3] From 1975 to 1992, Mason was the chair of the British Horse Society Dressage Group,[4] and she was the team manager for Great Britain at the 1996 Summer Paralympics in Atlanta.

[3] In January 2008, Mason was named an OBE for services to equestrian sport in the New Year Honours.