Karl Felix Helmer Rosenqvist^{[needs IPA]} (born 7 November 1991) is a Swedish professional racing driver who currently drives the No. 60 Honda for Meyer Shank Racing (MSR) in the IndyCar Series. He was named the 2019 IndyCar Rookie of the Year and won the 2026 Indianapolis 500.

Rosenqvist started his single-seater career in Asia, where he won the Formula Renault 2.0 Asia in 2008, and the Formula Renault 2.0 Sweden/NEZ title in 2009.

In 2010, Rosenqvist was fifth in the German Formula Three Championship with two victories, eight podiums, and one pole position. He also qualified seventh in his debut, with the same Swedish/British racing team Performance Racing, finishing ninth in the 2010 Macau Grand Prix Formula Three.

In 2011, Rosenqvist graduated to the Formula 3 Euro Series, with the Mücke Motorsport team, where he finished his rookie year fifth, with one win, ten podiums, and five fastest laps, and won the Masters of Formula 3.

In 2012, Rosenqvist finished third in the 2012 European Formula 3 Championship and finished second in Macau Grand Prix.

The year after, Rosenqvist narrowly missed out on the 2013 European Formula 3 Championship title to Raffaele Marciello, however, he won for a second time from the pole position, the Masters of Formula 3. he started the race from the front row, but collided with Raffaele Marciello and Pipo Derani to retire from the race in the first lap, in the Macau Grand Prix 2013.

In his fourth year with Mücke Motorsport, Rosenqvist finished eighth in the 2014 European Formula 3 Championship. He ended 2014 with a win from pole position ahead of teammate Lucas Auer in the Macau Grand Prix.

In 2015, Rosenqvist switched to Prema Powerteam, claiming the 2015 European Formula 3 Championship title with 13 victories, 24 podiums, and 17 pole positions. He would also take his second consecutive victory, again from pole position, in the 2015 Macau Grand Prix. His extended Formula 3 career meant that he would become the most successful Formula 3 racer of all time.