William Arthur "Candy" Cummings (October 18, 1848 – May 16, 1924) was an American professional baseball player. He played as a pitcher in the National Association and National League. Cummings is credited with inventing the curveball. He was elected to the Baseball Hall of Fame in 1939.

Cummings was born in Ware, Massachusetts. He later said that he thought of the idea of the curveball when fooling around with clam shells as a teenager in Ware. At the age of 17, Cummings made his professional baseball debut in the National Association of Base Ball Players with the Excelsior baseball club of Brooklyn. His first game with the team was on August 14, 1866 against the New York Mutuals. Ten days later he led his team to a 24-2 win against the Newark Eurekas. After the latter game, baseball writer Henry Chadwick commented on the skills of the young Cummings and his promising future with the Excelsior club. Cummings played for the Excelsiors next season and continued as the main pitcher for the Stars of Brooklyn from 1868 to 1871.

Cummings, who stood 5'9" and weighed 120 pounds, compiled a 145-94 career record and 2.49 ERA while playing for five different teams from 1872 to 1877. Between 1872 and 1875, Cummings pitched in the National Association (NA) with the New York Mutuals, Baltimore Canaries, and Hartford Dark Blues. Cummings won between 28 and 35 games in each of his NA seasons. He spent only two seasons in the National League (NL), earning a 16-8 win-loss record with Hartford when the league began in 1876 and a 5-14 record with Cincinnati the next year. Among other records, Cummings was the first player to record two complete games in one day: September 9, 1876 when he beat the Cincinnati Reds 14-4 and 8-4.

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