The 2018 Trans-Am Series season was the fiftieth running of the Sports Car Club of America's Trans-Am Series. It began on March 2 at Sebring International Raceway and ran for twelve rounds.
TA, TA3, TA4 competed together at all events except Pittsburgh, where TA ran a dedicated race and a separate race was held for TA3 and TA4, and at Daytona, where all classes competed together. TA2 competed in a dedicated race at all events except Daytona. Overall winners in bold.
All classes raced together on track, except in the meetings shared with the National Championship. Bold indicates overall winner.