Martinius Kleve Stenshorne (Norwegian pronunciation: [mɑːˈʈɪ.niʉs ˈklɛ.ʋə ˈstɛːns.hʊ.ɳə];[1] born 2 February 2006) is a Norwegian racing driver who is set to compete in the 2025 FIA Formula 3 Championship with Hitech TGR, having previously competed the previous year with the same team.

[11] Stenshorne made his single-seater debut in the 2022 Formula 4 UAE Championship with R-ace GP.

[20] Stenshorne was also set to compete full-time in the 2022 ADAC Formula 4 Championship, but VAR withdrew from the first round due to supply chain concerns.

[25] For his main campaign, Stenshorne raced in the Formula Regional European Championship with R-ace GP.

[29] He performed a masterclass double victory during the third round in Hungary, giving him an early championship lead.

[32] He would eventually lose the standings lead to Italian F4 rival Andrea Kimi Antonelli (who won the second Mugello race as Stenshorne and Santiago Ramos collided across the line fighting for third) during the next round at Paul Ricard.

[37] In November that year, Stenshorne took part in the Macau Grand Prix's Formula 4 races with Pinnacle Motorsport, but failed to finish.

[41] In April 2024, Stenshorne made a cameo appearance in the GB3 Championship with Chris Dittmann Racing.

[43] Stenshorne partook in the 2023 Formula 3 post-season testing sessions with Hitech Pulse-Eight, setting the fastest time in the afternoon in Jerez.

[50] He returned to the points in Barcelona with fourth place during the sprint, but was unlucky to suffer a puncture on the last lap from battling Van Hoepen for seventh.

[56] Ahead of the 2024 Imola Formula 3 round in May, Stenshorne joined the McLaren Driver Development Programme.