Wittmann conducted multiple
DTM tests for
BMW at the end of 2011, after which he was signed to be the marque's official test driver for the
2012 season. In addition, he would compete in a number of endurance events in
GT3 machinery, most notably at the
24 Hours of Nürburgring where he finished ninth.
2013 would become Wittmann's maiden year in the DTM, as he would be piloting a
BMW M3 DTM for
Team MTEK. He made a strong impression initially, getting points in his first two starts before finishing second at the
Red Bull Ring. He later scored a pole at
Zandvoort and finished the season eighth in points, highest of all rookies. Entering the
2014 season with
Team RMG, Wittmann would start out strongly with a win at Hockenheim. An off in the rain at
Oschersleben was followed by a dominant victory at the
Hungaroring which put him back into the championship lead. After two further points finishes, Wittmann would take control of the title hunt by winning the races in Spielberg and the
Nürburgring, before taking the title at the third-to-last event with a sixth place. He capped off the year with a podium at Zandvoort and fifth place in Hockenheim, finishing 50 points ahead of runner-up
Mattias Ekström. Wittmann returned to Team RMG in
2015, once again partnering
Maxime Martin. The season, now containing two-race weekends, did not start well, as Wittmann only scored three points finishes in the first six races. He would return to the top step at Zandvoort, defending well against fellow BMW driver
António Félix da Costa, but was only able to follow this up with a podium in
Moscow and one at Oschersleben, eventually ending up sixth in the standings. During the summer of 2015 meanwhile, Wittmann was able to test the
Toro Rosso STR10 Formula One car at the Red Bull Ring, garnering praise from race engineer Phil Charles for his technical feedback, cleanness, and long-run rhythm. After a mixed first round of
2016, the RMG driver managed to win from pole in Spielberg, before going on a points-scoring streak that lasted for nine races. Wittmann took two huge steps towards a second DTM title by winning race two in Moscow and race one at the Nürburgring, taking both wins in a controlling manner. The title fight would become tighter following a disqualification for a technical infringement in Hungary however, whereafter Wittmann led the standings by just 14 points to
Edoardo Mortara. On Saturday in Hockenheim Wittmann was able to extend the gap by finishing second to Mortara's third, and despite the Italian's victory on Sunday the BMW driver reclaimed the title by finishing fourth. Wittmann began his
2017 season with a luckless start, exemplified by a car-related retirement at the Hungaroring with two laps remaining. He would return towards stronger results in the latter half of the campaign, scoring four podiums in the final five events, though he also garnered attention for his repeated critique of
Audi's drivers and their driving etiquette over the team radio. Wittmann ended the year by winning at the season finale, which put him fifth in the championship. In
2018, Wittmann was comprehensively beaten in the standings by
Gary Paffett,
René Rast, and
Paul di Resta, coming home fourth overall after winning in Hungary and defending well against Mortara to take the spoils at the Norisring. in 2025 Having taken part in the
Formula E test after the
Marrakesh ePrix with
BMW i Andretti Autosport at the start of 2019, Wittmann returned to contest a sixth
DTM season as part of Team RMG. It started off positively, as Wittmann triumphed from pole at the Hockenheim season opener and qualified first again at
Zolder. He then won again at
Misano before going on a small streak during the middle of the year, winning race one at
Assen, finishing second in race two despite starting from the back of the grid before winning at
Brands Hatch, briefly putting himself into the title fight with René Rast and
Nico Müller. Unfortunately for the German, he was only able to score two podiums in the remaining three events while Rast and Müller pulled away with multiple victories; thus, Wittmann ended the season third in points. In
2020, the final season of the DTM "Class 1" era, Wittmann experienced his worst year of his DTM tenure so far, only finishing on the rostrum three times and placing ninth in the standings. In the face of a dominant Audi team, Wittmann stated that he was happy to begin new projects following the 2020 season. == GT career (2021—) ==