James Michael Wolf
- Height 6' 0", Weight 205 lb.
- High School El Camino Real High School
An umpire, Jim Wolf is the brother of pitcher Randy Wolf and cousin of former minor leaguer and 1984 Olympian Sid Akins. He umpired his first major league games as part of the National League staff in 1999 and became a full-time member of the consolidated major league umpiring staff in 2001, after having worked a few more games in 2000.
He worked his first postseason games in 2007, in the Division Series and has worked at least one postseasons series each year from 2014 to 2019. He would likely have kept his streak alive in 2020 were it not for an injury he suffered while working just his 7th game of the abbreviated season on August 1st. Most umpire injuries occur behind home plate, but he was working third base in a game between the Texas Rangers and San Francisco Giants. With Rangers runners on first and third base, P Drew Smyly attempted to pick-off Joey Gallo at first base, putting him in a rundown between first and second base. Elvis Andrus, who was on third base, took off for home. Giants 2B Donovan Solano threw to 3B Evan Longoria to start another rundown, this one on Andrus. Longoria relayed to C Tyler Heineman, who chased Andrus back to third, then threw to Solano, who had moved in behind Longoria to cover the bag. However, Heineman then crashed into Wolf, who still managed to call Andrus safe from the ground. He remained in the game but was later diagnosed with a concussion, and did not work another game that season.