The 2021 Styrian Grand Prix (officially known as the Formula 1 BWT Großer Preis der Steiermark 2021) was a Formula One motor race that took place on 27 June 2021 at the Red Bull Ring in Spielberg, Austria as the eighth round of the 2021 Formula One World Championship. It was the second and final Styrian Grand Prix, and the thirty-fourth Grand Prix held at the venue. The event was added to the schedule after other races were cancelled because of the COVID-19 pandemic, forming the second leg of a series of three races on back-to-back weekends. The race was won from pole position by Red Bull Racing driver Max Verstappen, who led every lap of the race. Lewis Hamilton, driving for the Mercedes team, finished second and set the fastest lap, with his teammate Valtteri Bottas finishing third.

The event was held over the weekend of 25–27 June, and is officially named the Formula 1 BWT Großer Preis der Steiermark 2021. It was the eighth round of the 2021 Formula One World Championship, and the second Styrian Grand Prix following the first edition held the previous year. It was held at the 4.318-kilometre (2.683 mi), ten-corner Red Bull Ring in Spielberg, Austria, the sixteenth world championship Grand Prix held on the modern version of the circuit, and the thirty-fourth in total. Of the locations on the 2021 schedule, Spielberg falls behind only Mexico City in terms of altitude. Changes had been made to the verge and barrier at the second and third corners and to the kerb at the sixth turn since the previous year. It was hoped that the changes made would prevent drivers from gaining an advantage by leaving the track. The kerbs at the venue are known for the demand they place on the suspension of cars that run over them.

The event was added to the schedule after the Canadian Grand Prix was cancelled and the Turkish Grand Prix was postponed, both because of the COVID-19 pandemic. As a result of these changes, the Styrian Grand Prix formed the second leg of a series of three races on consecutive weekends, following the 2021 French Grand Prix in Le Castellet, Var and preceding the 2021 Austrian Grand Prix, which was also held in Spielberg. The addition of a fourth group of three back-to-back races to the already-crowded calendar received criticism, with concerns expressed over the workload and its effect on the mental health of workers who travel to the races. This race was held with a limited number of spectators in attendance, while the following week's Austrian Grand Prix had a much larger crowd. At the time outdoor events in Austria could have no more than three-thousand attendees, however the large size of the venue meant spectators could be split into five separate groups, allowing a crowd of fifteen-thousand. The 2021 W Series hosted its season's first round as a support race.

Sole Formula One tyre supplier Pirelli were expected to bring their middle three dry-weather tyre compounds in terms of hardness—the C2, C3, and C4—which were originally intended for the next round. Ten constructors and twenty drivers participated, with no changes from the season entry list. Robert Kubica drove for Alfa Romeo Racing in the first free practice session in place of Kimi Räikkönen. Max Verstappen entered the event leading the World Drivers' Championship, with a twelve-point advantage ahead of Lewis Hamilton, while Red Bull Racing led the World Constructors' Championship by thirty-seven points from the Mercedes team. Verstappen, who had won Grands Prix at the circuit twice before, felt that the race would be close between Red Bull and Mercedes and that understanding the weather conditions would be important. Hamilton described Spielberg as "a power-hungry circuit", believing that Red Bull had a straight-line speed advantage and that it would be necessary for Mercedes to "maximise absolutely everything" to compete with them. Hamilton had swapped chassis with teammate Valtteri Bottas for the previous round at Le Castellet, but in Spielberg the pair returned to using the chassis they had used from the third-through-sixth rounds. Red Bull had a new floor and diffuser at this event, which created more downforce in slower corners and allowed the team to reduce drag elsewhere on the car.

The first practice session passed without major incident and ended with Red Bull's Verstappen fastest ahead of Scuderia AlphaTauri's Pierre Gasly and Mercedes driver Hamilton. Sergio Pérez and Carlos Sainz Jr were amongst the drivers who had spins during this session. There was some very light rain during Friday's running which did not effect proceedings significantly.

Verstappen set the fastest official time in the second free practice session with Daniel Ricciardo second for McLaren and the Alpine team’s Esteban Ocon third, after Hamilton had a faster lap time disallowed for a track limits violation. Bottas spun in the pit lane after leaving in second gear; he was penalised for this, being required to start from three positions further back in the race and having two penalty points added to his FIA Super Licence. Gasly did not participate in this session because the AlphaTauri mechanics were attempting to diagnose a fault with his car's engine.

Hamilton set the fastest lap in the third practice session followed by Verstappen in second, and Bottas in third. Verstappen felt that Hamilton had impeded him during his fast runs. Bottas and Gasly nearly collided in the pit lane while Gasly was exiting his pit garage.

Qualifying started at 15:00 local time on the Saturday. Qualifying was held under clear skies with ambient temperatures between 25 and 27 °C (77 and 81 °F) and surface temperatures between 53 and 55 °C (127 and 131 °F). The session is composed of three segments. At the end of the first two parts the five slowest drivers have their qualifying positions set and are prevented from participating in the rest of the qualifying session. The final segment determines the top ten qualifying positions. The qualifying results are then used to determine the starting order of the race.