Vaughn Jefferis (born 20 May 1961 in Huntly) is a New Zealand horseman who won a Bronze medal at the Olympic Games.
Initially competing in showjumping Jefferis switched to Eventing in 1990 and had immediate success, being part of the Gold medal team at the World Equestrian Games in Stockholm riding Enterprise.
Jefferis purchased Bounce in 1994 and rode the horse for the remainder of his international career.
They won the world individual title in 1994 at The Hague, a Bronze medal in the team event at the 1996 Summer Olympics, the team Gold at the 1998 World Championships in Rome.
Their last event was at the 2000 Summer Olympics in Sydney but they did not complete the event.