The 2025 FIA Formula One World Championship is an ongoing motor racing championship for Formula One cars and the 76th running of the Formula One World Championship. It is recognised by the Fédération Internationale de l'Automobile (FIA), the governing body of international motorsport, as the highest class of competition for open-wheel racing cars. The championship is contested over twenty-four Grands Prix held around the world. It began in March and will end in December.

Drivers and teams compete for the titles of World Drivers' Champion and World Constructors' Champion, respectively. Max Verstappen, driving for Red Bull Racing-Honda RBPT, is the reigning Drivers' Champion, while McLaren-Mercedes, who were the reigning Constructors' Champions, secured their tenth title, and second in a row, at the Singapore Grand Prix, the first time McLaren had won consecutive constructors' titles since 1991.

The 2025 season is the last year to utilise the power unit configuration introduced in 2014. A revised configuration without the Motor Generator Unit-Heat (MGU-H), but with a higher power output from the Motor Generator Unit-Kinetic (MGU-K), will be introduced for 2026. 2025 also marks the final year of the ground-effect generation of cars introduced in 2022, and the last year of the drag reduction system (DRS) introduced as an overtaking aid in 2011, as cars with active aerodynamics and moveable wings will be introduced in 2026.

2025 also marks Renault's final season as an active engine supplier for its team Alpine, with the manufacturer planning to discontinue engine production post-2025.

All teams compete with tyres supplied by Pirelli. Each team is required to enter at least two drivers, one for each of the two mandatory cars.

On four occasions throughout the season, twice for each of its cars, each team has to field a driver who has not competed in more than two races, in one of the first two free practice sessions. The debuts of Gabriel Bortoleto, Isack Hadjar, Kimi Antonelli and Jack Doohan's participation at the Australian and Chinese Grands Prix fulfilled both of the required rookie sessions for their respective cars at Mercedes, Sauber, Racing Bulls and Alpine.

RB discontinued its use of initialism and entered instead as Racing Bulls, thus changing its team and constructor name.

Lewis Hamilton left Mercedes after twelve seasons to join Ferrari, ending his record breaking streak of the most consecutive seasons driving for a single constructor, as well as competing in his first season without a Mercedes power unit. He replaced Carlos Sainz Jr., who left Ferrari after four seasons to join Williams on a multi-year deal. Sainz was initially set to replace Logan Sargeant, but Sargeant was replaced by Franco Colapinto midway through the 2024 season. Hamilton was replaced by Mercedes junior Kimi Antonelli, who was promoted from Formula 2. In January 2025, Colapinto left Williams to join Alpine as a reserve driver.