The 2026 F4 Japanese Championship season was the twelfth season of the F4 Japanese Championship.
This was the third season for the second-generation MCSC-24 chassis constructed by Toray Carbon Magic, and TOM'S TMA43 engine which produces 180 horsepower.
All teams competed with an identical Toray Carbon Magic MCSC-24 chassis and TOM'S 2-litre naturally aspirated engine.
All seven rounds are be held in Japan. Six rounds are supporting the Super GT events in Japan, with only Okayama that supporting Super Formula Lights.
Points were awarded as follows: