Robert Allenby (born 12 July 1971) is an Australian professional golfer.
Allenby was born in Melbourne, Australia. His father was from Leeds, England and emigrated to Australia as a young man.
He turned professional in 1992 and was soon successful, topping the PGA Tour of Australasia Order of Merit in his first season and again in 1994. He continues to play some events on his home tour and has won 13 events on it, including one as an amateur. He also began to play on the European Tour and it was his principal tour until 1998. He won four tournaments on it, including three in 1996, when he finished third on the Order of Merit. He has featured in the top 10 of the Official World Golf Rankings.