Major Sir Shane Gabriel Basil Blewitt, GCVO (born 25 March 1935) is a British courtier and retired military officer. He served in the Irish Guards from 1956 to 1974 in BAOR, Germany, Northern Ireland, Aden, and Hong Kong, attaining the rank of Major. 
The son of Colonel Basil Blewitt, Shane and Monica Julia, formerly Morrogh Bernard, daughter of Major Robert Henry Calvert and Monica (née Buxton), wed on 16 June 1969. Major Shane Blewitt has two stepchildren by his wife's first marriage.
- Keeper of the Privy Purse and Treasurer to HM The Queen (1988–96) 
- Assistant Keeper of the Privy Purse and Treasurer to HM The Queen (1975–85)
- Deputy Keeper of the Privy Purse and Treasurer to HM The Queen (1985–87)
- Extra Equerry to HM The Queen (1996–present)
- Member, Kings Fund General Council (1989-2010)
- Council, King Edward VII Hospital (1989-2010)
He was first appointed LVO in 1981, and elevated as follows:
- CVO (1987)
- KCVO (1989)
- GCVO (1996)
- "Maj Sir Shane Blewitt GCVO". Debretts People of Today.
- Profile at thepeerage.com
- Tomlinson, Richard (20 Dec, 1992). "They also serve, who only ush". Independent.