Charles Gladstone Allen (1868 – 1924) was a British tennis player in the early years of Wimbledon.

[1] He was an all comers finalist at 1896 Wimbledon Championships in the men's doubles event partnering with his brother Roy Allen, where the lost to Reginald Doherty and Harold Nisbet.

[3] In 1890 he won his first singles title in Saxmundham LTC Tournament (later known as the Suffolk Championships) against his twin brother Roy Allen.

At the 1896 Wimbledon Championships he reached the all comers final of the men's doubles event partnered with his brother Roy Allen, but were defeated by Reginald Doherty and Harold Nisbet.

Hunter Bird Allen, the Rector of Colmworth Parish,[8] and Adelaide Mary Gladstone.