Jimmy Fennig (born September 15, 1953 in Milwaukee, Wisconsin) is a longtime NASCAR crew chief.

[2] Fennig returned to the Winston Cup Series as the crew chief for Bobby Allison at Stavola Brothers Racing in 1987.

Earlier, Fennig had owned a car that Allison raced in Wisconsin and Michigan on Saturday nights.

[2] The following season, he was paired with fellow Wisconsin racer Dick Trickle, who won the 1989 Winston Cup Rookie of the Year award.

He started out the season as Jamie McMurray's crew chief, and he became the head of Roush Racing Busch Series effort.

For the 2013 season, Fennig replaced Chad Norris as crew chief for Carl Edwards.