Charles Lacy Sweet (1861–1892) was a British tennis player in the early years of Wimbledon.

In 1887, Sweet reached the semifinals before handing Ernest Renshaw a walkover into the all comer's final.

His career singles successes include winning eleven tournaments between 1882 and 1892, the Cirencester Park Lawn Tennis Tournament (1882-1883), Exmouth Open (1884), (1882), Portishead Open Lawn Tennis Tournament (1883), Sussex County Lawn Tennis Tournament, East Grinstead Open, (1884), Clifton Open (1882, 1884, 1886), Taunton (1889) and the Boulogne International Championship on clay in 1890.

Whilst his career doubles titles wins included the Mid Devon Lawn Tennis Tournament at Eggesford in 1883.

But from one cause or another he was never able to give that serious and unremitting attention to the game which successful tournament play exacts from its votaries.