The 2025 FIM Moto3 World Championship was the lightweight class of the 77th FIM Road Racing World Championship season. José Antonio Rueda won the championship title with four races to spare after winning the Grand Prix of Indonesia.

All teams used series-specified Pirelli tyres.

The following Grands Prix took place in 2025:

The following Grand Prix acted as a reserve for 2025:

Points were awarded to the top fifteen finishers. A rider had to finish the race to earn points.

Each constructor was awarded the same number of points as their best placed rider in each race.

The teams' standings were based on results obtained by regular and substitute riders; wild-card entries were ineligible.