The Red Bull Racing RB21 is a Formula One car designed and constructed by Red Bull Racing currently competing in the 2025 Formula One World Championship. It is being driven by defending World Champion Max Verstappen, who is joined by Liam Lawson and Yuki Tsunoda, the latter replacing Lawson from the Japanese Grand Prix. The RB21, which is powered by the Honda RBPTH003 power unit, is the last Red Bull Racing car to be powered by Honda RBPT-badged engines; from the 2026 season, Red Bull and its sister team Racing Bulls will utilise Red Bull Powertrains Ford engines.

The RB21 is the first Red Bull Racing car since the RB2 to not be designed by former Chief Technical Officer Adrian Newey, and the first car to be designed by Technical Director Pierre Waché who is now overseeing all aspects of any future Red Bull challengers from design to production with the RB21 being the first car for which he oversaw both the design and production process.

As of the 2025 Canadian Grand Prix, the car has achieved two wins and five podiums, three pole positions, and one fastest lap, all with Verstappen.

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