Paul Vincent Nicholas Haarhuis (born 19 February 1966) is a Dutch former professional tennis player. He is a former World No. 1 doubles player. He won six Grand Slam men's doubles titles, five with Jacco Eltingh and one with Yevgeny Kafelnikov.

Haarhuis was born on 19 February 1966 in Eindhoven in the Netherlands. He played tennis for Florida State University.

In June 1995, he reached his highest singles ranking of World No. 18. He is best remembered for his success in doubles with fellow countryman Jacco Eltingh, winning five Grand Slam titles together. In his career he has won one singles title and 54 doubles titles.

He is, together with Sergi Bruguera, Richard Krajicek, Leander Paes, and Michael Stich, the only player of the same generation with a positive head-to-head record against Pete Sampras: 3–1.

After retiring, he won the end of the year Blackrock Masters Tennis tournament in the Royal Albert Hall in 2005 and 2006, beating legends such as Goran Ivanišević and John McEnroe. He completed a hat-trick of victories in the tournament in 2007, beating Frenchman Guy Forget.