Klaas Willem Ruis (Haarlem, March 29, 1945 – Dénia, Spain, August 4, 1986) was a Dutch television presenter. He presented, among others, the Willem Ruis Show for the KRO and De Willem Ruis Lotto Show, 5 tegen 5, and the Sterrenshow for the VARA. His actual given name was Klaas.