Keith Deller (born 24 December 1959 in Ipswich) is an English darts player who won the Embassy World Professional Darts Championship in 1983. He was the first qualifier ever to win the championship and remains one of the youngest champions in history. For his world championship win Deller used 18 gram spring loaded darts, later banned for tournament play but now legal again. He no longer uses these darts. Deller currently works for Sky Sports as a "spotter" along with Eric Bristow; they use their knowledge and experience to work out for the camera crew where players will be aiming with their next dart.
Deller is also the manager of two time PDC World Champion Adrian Lewis.