James J. Baldwin, Jr. (born July 15, 1971) is a former Major League Baseball pitcher. He batted and threw right-handed. In his 11-season career, he played for the Chicago White Sox (1995-2001), Los Angeles Dodgers (2001), Seattle Mariners (2002), Minnesota Twins (2003), New York Mets (2004), Texas Rangers (2005), and Baltimore Orioles (2005).

Drafted by the Chicago White Sox in the 4th round of the 1990 MLB June Amateur Draft, he made his major league debut on April 30, 1995, for the White Sox. In spring training of that same season, Baldwin was the first pitcher to pitch to Michael Jordan, in an intrasquad game in spring training. In 2000, he made the Major League Baseball All-Star Game as a member of the White Sox. He pitched part of the ninth inning of that game, giving up Chipper Jones' final hit of the game, that being the only home run of the night, which ignited a short-lived National League comeback. On January 24, 2006, he signed a minor league contract with the Toronto Blue Jays, but was released on April 22.

Baldwin is currently the Pitching Coach for the baseball team at Pinecrest High School in Pinehurst, North Carolina.