The Red Bull Racing RB21 is a Formula One car designed and constructed by Red Bull Racing set to compete in the 2025 Formula One World Championship.

It is set to be driven by defending World Champion Max Verstappen, who will be joined by Liam Lawson.

The RB21, which will be powered by the Honda RBPTH002 power unit, will be 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.

[2] 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.

The livery of the car was unveiled at the F1 75 event at The O2 Arena, along with other teams, on February 18, 2025.