Derek John Tarr (born September 15, 1959) is an American former professional tennis player, originally from South Africa.

[2] He defeated Mike De Palmer at the 1983 US Open and beat Christophe Roger-Vasselin at the 1984 Wimbledon Championships.

[2] His best performance on tour came in the 1984 Cincinnati Open, part of the Grand Prix Tennis Championship Series, where he reached the round of 16.

[2] He registered upset wins over Tim Mayotte at Queen's in 1982 and Henri Leconte in the 1985 Madrid Tennis Grand Prix event.

[2] The best win of his doubles career came in 1983 at the Sovran Bank Classic, where he and Jonathan Canter upset top seeds Mark Edmondson and Sherwood Stewart, who had just won the French Open.