Charles Walder Grinstead (1 December 1860 – 16 March 1930) was an English champion tennis player. He reached the quarter finals at Wimbledon 1883. Grinstead reached the Wimbledon All Comers Final in 1884, where he beat Ernest Renshaw before losing to Herbert Lawford. Together with C. E. Weldon, Grinstead won the Oxford Men's Doubles in 1883. In 1884, the Oxford Men's Doubles event and its trophy were handed over to the All England Club to be known as the All England Men's Doubles as part of the Wimbledon Championships; consequently winners of the Oxford events are included as Wimbledon champions.