The 2021 Formula Regional Japanese Championship was a multi-event, Formula 3 open-wheel single seater motor racing championship held in Japan.
Yuga Furutani took the drivers' title ahead of Ai Miura, while his team TOM'S Youth won the teams' title and Takashi Hata earned Masters' class honors.
All teams and drivers competed using the Dome F111/3 Regional F3 car.
For the first time, the series was planned to be on the Formula One support bill, at the 2021 Japanese Grand Prix.
[6] After the changes in the calendar, it was to support FIA World Endurance Championship at 2021 6 Hours of Fuji instead, before that race was cancelled.