Robert-Jan Derksen (born 3 January 1974) is a Dutch professional golfer.
Derksen was born in Nijmegen. He won the Dutch Amateur Championship four years in a row from 1993 to 1996 and turned professional in 1996.
Derksen began his professional career on the Asian Tour in 1997. At the end of the year, he returned to Europe and earned his European Tour card for the 1998 season via qualifying school. He initially struggled to maintain his place on the main tour and has returned to qualifying school on five occasions. He has not always been successful in regaining his card, dropping down to the second tier Challenge Tour twice, where he finished 8th on the end of season rankings in 2001. His first win on the European Tour came in 2003 at the prestigious Dubai Desert Classic. His only other title to date was the 2005 Madeira Island Open Caixa Geral de Depositos, a European and Challenge tour dual ranking event.