The 2021 Japanese Super Formula Championship was the forty-ninth season of premier Japanese open-wheel motor racing, and the ninth under the moniker of Super Formula. Naoki Yamamoto entered the 2021 season as the defending drivers' champion.

Tomoki Nojiri took his first drivers' championship at the penultimate round at Motegi, while Team Impul took their first teams' championship since 2010 at the season finale.

Every Honda-powered car used a Honda HR-414E engine and every Toyota-powered car used a Toyota RI4A engine.

Team	Engine	No.	Driver	Rounds
TCS Nakajima Racing	Honda	1	Naoki Yamamoto[1]	All
		64	Toshiki Oyu[2]	All
Kondo Racing	Toyota	3	Kenta Yamashita[3]	All
		4	Yuichi Nakayama[4]	1–5
			Sacha Fenestraz[3]	6–7
Docomo Team Dandelion Racing	Honda	5	Nirei Fukuzumi[2]	All
		6	Ukyo Sasahara[4]	1–2
			Tadasuke Makino[1]	3–7
carrozzeria Team KCMG	Toyota	7	Kazuto Kotaka[4]	1–5, 7
			Kamui Kobayashi[3]	6
		18	Yuji Kunimoto[3]	All
Drago Corse with ThreeBond[5]	Honda	12	Tatiana Calderón[1]	1–2, 6–7
			Koudai Tsukakoshi[6]	3–5
NTT Communications ROOKIE	Toyota	14	Kazuya Oshima[3]	All
Red Bull Mugen Team Goh[a] Team Mugen[2][a]	Honda	15	Hiroki Otsu[7]	All
		16	Tomoki Nojiri[2]	All
carenex Team Impul	Toyota	19	Yuhi Sekiguchi[3]	All
		20	Ryō Hirakawa[3]	1–3, 5–7
			Mitsunori Takaboshi[8]	4
Kuo Vantelin Team TOM’S	Toyota	36	Kazuki Nakajima[3]	1, 6
			Giuliano Alesi[9]	2–5, 7
		37	Ritomo Miyata[3]	All
P.mu/Cerumo・INGING	Toyota	38	Sho Tsuboi[3]	All
		39	Sena Sakaguchi[3]	All
B-Max Racing[2]	Honda	51	Nobuharu Matsushita[10]	2–7

• Team Mugen run one car, as the other car run together with Servus Japan under Team Goh. The team named Red Bull Mugen Team Goh.
• Rookie Racing who previously operated by Cerumo, would run independently by themselves. The team get new title partner from NTT Communications, the team named NTT Communications ROOKIE.
• Team Impul runs new sponsorship from Itochu as they will run under black gold colour. The team rebranded as carenex Team Impul.

• Three-time and defending series champion Naoki Yamamoto moved to TCS Nakajima Racing after spending two seasons with Dandelion Racing. This was Yamamoto's first time driving for Nakajima Racing since his rookie season in 2010. While Tadasuke Makino moved to Docomo Team Dandelion Racing after two seasons with Nakajima Racing.^[2]
• Hiroki Otsu gets a full time seat after an appearance in the last round in 2020, as he raced with Red Bull Mugen Team Goh.^[7]
• 2019 series champion Nick Cassidy has exited the series, following his move to the FIA Formula E World Championship with Envision Virgin Racing. Cassidy's replacement is Super Formula Lights champion Ritomo Miyata, who race for two races in 2020 in relief of Kazuki Nakajima.^[3]
• Two-time series champion Hiroaki Ishiura has retired from the series. With reigning Formula Regional Japanese Champion Sena Sakaguchi picked as Ishiura's replacementfor P.mu/Cerumo・INGING.^[3]
• Yves Baltas was scheduled to compete for B-Max Racing, but did not enter any rounds.^[11]

• Kamui Kobayashi: missed all but the sixth round at Motegi due to commitments in the WEC and IMSA. Kazuto Kotaka was his replacement.
• Sacha Fenestraz missed the first five rounds because of visa issues. Yuichi Nakayama was his replacement.
• Tadasuke Makino missed the first two rounds of the season due to a his recovery from meningitis. Ukyo Sasahara was his replacement.
• Nobuharu Matsushita: joined B-Max Racing from the second round at Suzuka. He was initially denied an engine lease from Honda, after signing a factory racing contract with Nissan in the Super GT Series. This prevented him from racing in the opening round at Fuji. Honda would reverse their decision after Masaya Nagai replaced Hiroshi Shimizu as the Director of Motorsport at Honda.^[12]
• Kazuki Nakajima missed both Suzuka rounds, Autopolis, SUGO, and the fifth round at Motegi. Giuliano Alesi was his replacement.
• Tatiana Calderon missed Autopolis, Sugo, and the fifth round at Motegi (was able to participate in the April Suzuka round because of local regulations with her licence, which is from the ACC, the Colombian ASN of the FIA, unlike the Japanese drivers, who have JAF licences). Koudai Tsukakoshi was her replacement for the third to the fifth round.
• Ryo Hirakawa missed the SUGO round because he was tested TGR WEC car and not make in time for quarantine. Mitsunori Takaboshi covers for him.

The provisional calendar was announced on 6 August 2020. After heavy disruptions to the 2020 season due to the COVID-19 pandemic, the series returned to a more traditional schedule, with Suzuka Circuit hosting the season finale as it was usual.^[13] On 12 April 2021, the organisation announced the cancellation of the Okayama round, which was due to be held in the first week of October. Instead, a second round at Motegi was confirmed.^[14]

Round	Circuit	Pole Position	Fastest Lap	Winning driver	Winning team
1	Fuji Speedway	Tomoki Nojiri	Toshiki Oyu	Tomoki Nojiri	Team Mugen
2	Suzuka International Racing Course	Nirei Fukuzumi	Hiroki Otsu	Tomoki Nojiri	Team Mugen
3	Autopolis	Giuliano Alesi	Tomoki Nojiri	Giuliano Alesi	Kuo Vantelin Team TOM’S
4	Sportsland SUGO	Yuhi Sekiguchi	Tomoki Nojiri	Nirei Fukuzumi	Docomo Team Dandelion Racing
5	Twin Ring Motegi	Tomoki Nojiri	Yuhi Sekiguchi	Tomoki Nojiri	Team Mugen
6	Twin Ring Motegi	Hiroki Otsu	Toshiki Oyu	Hiroki Otsu	Red Bull Mugen Team Goh
7	Suzuka International Racing Course	Nobuharu Matsushita	Tomoki Nojiri	Nirei Fukuzumi	Docomo Team Dandelion Racing

Race points

Qualifying points

Pos	Driver	FUJ	SUZ1	AUT[b]	SUG	MOT	MOT2	SUZ2	Points
1	Tomoki Nojiri	11	12	5	6	11	53	3	86
2	Nirei Fukuzumi	3	Ret1	13	1	Ret	12	13	55
3	Yuhi Sekiguchi	17†	4	10	31	22	4	4	55
4	Ryō Hirakawa	4	2	Ret		4	Ret	2	46
5	Toshiki Oyu	22	103	7	2	6	14	112	41
6	Hiroki Otsu	16	5	6	10	10	11	5	38.5
7	Sena Sakaguchi	9	11	23	83	5	2	13	35.5
8	Nobuharu Matsushita		13	3	4	33	6	121	33.5
9	Tadasuke Makino			14	52	7	3	10	24
10	Ritomo Miyata	7	6	42	7	8	9	14	22
11	Giuliano Alesi		9	11	9	16		8	20
12	Ukyo Sasahara	53	3						18
13	Naoki Yamamoto	6	8	9	12	12	Ret2	9	13
14	Kenta Yamashita	12	12	11	14	15	8	6	8
15	Sho Tsuboi	Ret	7	Ret	15	9	Ret	16	6
16	Kazuki Nakajima	11					7		4
17	Sacha Fenestraz						13	7	4
18	Yuji Kunimoto	8	Ret	Ret	13	11	Ret	15	3
19	Kazuya Oshima	10	15	8	18	Ret	11	17	2.5
20	Kamui Kobayashi						10		1
21	Mitsunori Takaboshi				11				0
22	Koudai Tsukakoshi			12	16	Ret			0
23	Yuichi Nakayama	14	14	15	Ret	13			0
24	Tatiana Calderón	13	17				Ret	19	0
25	Kazuto Kotaka	15	16	16†	17	14		18	0
Pos	Driver	FUJ	SUZ1	AUT	SUG	MOT	MOT2	SUZ2	Points

• Japanese Championship Super Formula official website (in English)