Major Derek Swithin Allhusen, CVO was an English equestrian who was a 54-year-old grandfather when he rode Lochinvar to team gold and individual silver medals at the 1968 Summer Olympics in Mexico.
- Occupation
- equestrian, event rider
- Position held
- High Sheriff of Norfolk
- Citizenship
- United Kingdom, United Kingdom of Great Britain and Ireland
- Born
- January 9, 1914
- Died
- April 24, 2000
