"Butch" Lenzini Jr. (January 10, 1947 - November 13, 1996) was an American horse trainer in Thoroughbred flat racing best known for winning the 1982 Preakness Stakes, the second leg of the U.S.
Following in his father's footsteps, Lenzini Jr. earned his first win as a professional trainer in 1969 at Narragansett Park in Pawtucket, Rhode Island.
After relocating to race at tracks in Maryland, he was hired by Boston Bruins goalie Gerry Cheevers to trainer his horses, the best of which would be Grade 1 winner Royal Ski.
In July, Aloma's Ruler won the Jersey Derby at Monmouth Park but came out of a second-place finish in the August 21st Travers Stakes at Saratoga Race Course with an ankle injury that ended his career.
In 1984, John Lenzini Jr. moved his training operation to New York where he was the trainer for Brian J. Hurst and partners good runner, Eternal Prince.