William Karlsson

William Antonio Karlsson (born 18 October 2005) is a Swedish racing driver who competes in the LMP3 class of the Le Mans Cup for Inter Europol Competition.

Personal life Karlsson is the son of Nicklas Karlsson, a former racing driver who founded NIKA Racing in 2006.

Career Towards the end of 2019, Karlsson made his single-seater debut in the Aquila Synergy Cup Sweden. Moving to his family's NIKA Racing to race in Formula Nordic the following year, Karlsson took his only win of the season at Mantorp Park en route to fifth in points. Remaining in the series for 2021, Karlsson took seven wins and five other podiums to secure the series title. In 2022, Karlsson joined Renauer Motorsport to compete in the ACCR Formula 4 Trophy. However, he later joined BVM Racing to compete in the Italian F4 Championship, taking his only points of the season in race three at the Red Bull Ring.

Karlsson driving for KIC Motorsport at the Red Bull Ring in FRECA in 2023.

The following year, Karlsson joined Drivex to compete in the newly-formed Eurocup-3. Competing in the first three rounds, Karlsson scored his only points of the season at Aragón, finishing eighth and ninth in the two races. After a one-off appearance in Porsche Sprint Challenge Scandinavia, Karlsson joined KIC Motorsport to compete in select rounds of the Formula Regional European Championship, taking a best result of 20th at Monza.

After spending 2024 on the sidelines, Karlsson returned to single-seaters in early 2025 with Renauer Motorsport at the second Red Bull Ring round of F4 CEZ, finishing second twice. During 2025, Karlsson made his endurance prototype debut, racing for Inter Europol Competition at the Road to Le Mans in LMP3 Pro-Am, finishing fifth in both races. In 2026, Karlsson returned to Inter Europol and the Le Mans Cup to compete in his rookie season in the LMP3 class alongside Christian Dannemand Jørgensen.

Karting record Karting career summary

Racing record Racing career summary

Complete Italian F4 Championship results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete Eurocup-3 results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete Formula Regional European Championship results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap) Year Team 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 DC Points 2023 KIC Motorsport IMO1 IMO2 CAT1 CAT2 HUN1 HUN2 SPA1 SPA2 MUG1 MUG2 LEC1 LEC2 RBR1 RBR2 MNZ1MNZ2 ZAN1 ZAN2 HOC1 HOC2 40th 0

Complete Formula 4 CEZ Championship results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)

Complete Le Mans Cup results (key) (Races in bold indicate pole position; results in italics indicate fastest lap)