Jim Morris Jr. is a former professional pitcher. Morris played in the MLB for two seasons with the Tampa Bay Rays. Although brief, Morris' career is noted for making his MLB debut at the relatively advanced age of 35, in addition to after several arm surgeries. His story would later be dramatized into the 2002 film The Rookie.

Morris was originally selected 466th overall in the January 1982 amateur baseball draft by the New York Yankees but did not sign. He would then later be selected out of Ranger College fourth overall in the 1983 amateur draft (January Secondary) by the Milwaukee Brewers and signed with the organization. He suffered several arm injuries in the minor leagues, missing all of the 1986 season. After four pitching appearances in 1987, he was released, never having progressed past the single-A minor leagues. After not making it past the minors, he would go on to become a high school teacher and baseball coach for nearly a decade. A decade into his coaching, he made a promise to his team that if they made it to the championship, he would go try out for the MLB. His team made it, and consequentially he would try out for the Rays, made it, moved up through their minor league teams, and would finally make his MLB debut on September 18, 1999, against the Texas Rangers. 

Morris wrote an autobiography, The Oldest Rookie. He often appears as a motivational speaker. Morris released his second book, Dream Makers, in 2020. It deals with his life in the twenty years since his retirement from Major League Baseball.