John Lawrence Antonelli (July 15, 1915 – April 18, 1990) was an American third baseman in Major League Baseball in 1944–45 and a longtime coach and manager at the minor league level. The native of Memphis, Tennessee, batted and threw right-handed, stood 5 feet 11 inches (1.80 m) tall and weighed 165 pounds (75 kg).

Antonelli was one of the youngest and least-experienced managers in minor league baseball annals. In 1935, he signed his first professional contract with his hometown Memphis Chicks of the Southern Association, played in three games, batted 11 times, and garnered two hits for a .182 batting average. He was then assigned, at age 19, to be the playing manager of the Lexington Giants of the Class D KITTY League, where he batted .326 and led the Giants to a 42–44 won/loss mark. Antonelli remained a playing skipper in the KITTY League through 1937, where in his final season he managed the Union City Greyhounds, a farm club of the St. Louis Cardinals, to a first-place finish.

After 1937, he suspended his managing career and was purely a second baseman and third baseman with the Cardinals' Houston Buffaloes and Columbus Red Birds farm clubs for almost seven full seasons. Antonelli batted over .300 only once, but led his leagues in fielding percentage as both a second- and third baseman.

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