The 2021 Formula Regional European Championship by Alpine was a multi-event, Formula 3 open-wheel single seater motor racing championship held across Europe. The championship featured a mix of professional and amateur drivers, competing in Formula 3 cars that conform to the FIA Formula 3 regulations for the championship. This was the third season of the championship and the first after a merger with Formula Renault Eurocup which resulted to the change of the engine supplier to Alpine.
The season commenced on 17 April at Imola Circuit and concluded on 31 October at Autodromo Nazionale di Monza, after ten rounds.
Swiss driver Grégoire Saucy, driving for ART Grand Prix, took the drivers' title in Round 9 at Mugello.[1]