Rik de Voest (born 5 June 1980) is a former professional South African tennis player. He achieved his career-high singles ranking of world No. 110 in August 2006. Rik resides in Vancouver, Canada where he pursues a career in real estate. De Voest qualified for the 2007 Wimbledon Championships where he lost to Marat Safin in the first round. He also qualified for the US Open later on in 2007, where he defeated Thierry Ascione 6–2, 3–0 before Ascione retired. De Voest went on to lose to John Isner in the following round.