Red Bull Racing RB21

The Red Bull Racing RB21 is a Formula One car which was designed and constructed by Red Bull Racing and competed exclusively in the 2025 Formula One World Championship. It was driven by defending World Champion Max Verstappen, who was joined by Liam Lawson and Yuki Tsunoda, the latter replacing Lawson from the Japanese Grand Prix. The RB21, which was powered by the Honda RBPTH003 power unit, is the last Red Bull Racing car to be powered by Honda RBPT-badged engines, with Honda returning in a fully fledged capacity for the forthcoming new power unit rules and switching to powering the rival Aston Martin team from 2026. From the 2026 season, Red Bull and its sister team Racing Bulls will utilise Red Bull Powertrains Ford engines. The RB21 was 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. Two mid-season upgrades for the car have been introduced overall: first a package at Miami, and the second at Monza.

The RB21 followed the WDC-winning RB20. Red Bull had a turbulent season: the car was initially off the pace of the pace-setting McLaren MCL39, with both drivers reporting issues during pre-season tests. While Verstappen remained competitive by opening the season with a podium in Australia, and taking victories in Japan and Imola, the second seat fared much worse: Lawson initially held the seat until China, after which he was demoted back to Racing Bulls and replaced by Tsunoda. Persistent issues with the car, coupled with the underperformance of Tsunoda, resulted in Red Bull getting knocked out of contention after the Azerbaijan Grand Prix. Verstappen brought himself back into contention for the Drivers' Championship after winning the United States, Las Vegas, Qatar and Abu Dhabi Grands Prix, taking three consecutive victories. However, he was unable to secure the title with title rival Lando Norris securing it at the latter event by two points.

The car achieved eight wins, fifteen podiums, eight pole positions, and three fastest laps in Grands Prix, plus two sprint wins, all with Verstappen.

The livery of the car was unveiled at the F1 75 event at The O2 Arena, along with other teams, on 18 February 2025. The livery was similar to previous liveries, but with minor sponsorship changes.

At the Japanese Grand Prix, the RB21 featured a variation of the White Bull designed used at the 2021 Turkish Grand Prix, commemorating the final year of their partnership with Honda. The designed featured a matte white finish with satin red logos, emulating the racing colours of Japan.

At the 2025 Emilia Romagna Grand Prix, both cars were run with numbers in the style of the 2005-2013 Red Bull cars to commemorate their 400th Grand Prix.

Red Bull performed 304 laps around Bahrain International Circuit during pre-season testing. Following the testing, Verstappen concluded that, due to the lower average amount of completed laps - being the lowest of the ten teams overall - the team had 'work to do', with Lawson stating there were "teething gremlins" with the new car.

Red Bull's driver lineup for the first two races of 2025 consisted of defending champion Max Verstappen, who was paired with rookie Liam Lawson. Lawson previously raced part-time in 2023 and 2024 for two iterations of Red Bull's sister team - Scuderia AlphaTauri and Visa Cash App RB - both times replacing Daniel Ricciardo. Lawson first appeared in Red Bull and AlphaTauri's first free practice sessions starting from the 2022 Belgian Grand Prix.