The 2018 Japanese Formula 3 Championship was the 40th Japanese Formula 3 Championship season.
Calendar for the 2018 season. All races are scheduled to be held in Japan.
Race 9 at Okayama International Circuit was postponed due to severe weather conditions. The race was rescheduled for a later round at the same circuit, and was subsequently postponed again to be run at Sportsland SUGO.