John Louis Leary (May 2, 1891 – August 18, 1961) was a Major League Baseball first baseman and catcher who played with the St. Louis Browns in 1914 and 1915.
After his professional baseball career, he returned to coach at his alma mater Waltham High School. From 1920 to 1947 he coached football, and from 1948 until his retirement in 1959 he was athletic director. The school's Leary Field is named after him.