Jack Ryan (September 19, 1884 – October 16, 1949) was an American pitcher in Major League Baseball between 1908 and 1911.
Ryan was involved in a trade on February 16, 1909, in which he, Charlie Chech, and $12,500 went from the Cleveland Naps to the Boston Red Sox in exchange for future Hall of Fame pitcher Cy Young. After his playing career, Ryan was a pitching coach for the Red Sox from 1923 to 1927.