Round 4 of the 2021 Japanese Super Formula Championship was held at Sportsland Sugo, Japan on 20 June 2021. Yuhi Sekiguchi started on pole position Nirei Fukuzumi was the race winner.
Race Result
| Pos. | No. | Driver | Abbreviation | Nationality | Team | Engine | Tyre | Laps | Race Time | Gap | Best Lap | Lap | Speed |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | Nirei Fukuzumi | FUK | Japan | DOCOMO TEAM DANDELION RACING | HONDA/M-TEC HR-417E | Yokohama | 53 | 1:01:37.328 | - | 1:08.065 | 21 | 185.081 |
| 2 | 64 | Toshiki Oyu | OYU | Japan | TCS NAKAJIMA RACING | HONDA/M-TEC HR-417E | Yokohama | 53 | 1:01:41.074 | 3.746 | 1:07.279 | 13 | 184.893 |
| 3 | 19 | Yuhi Sekiguchi | SEK | Japan | carenex TEAM IMPUL | TOYOTA/TRD 01F | Yokohama | 53 | 1:01:42.542 | 5.214 | 1:08.277 | 6 | 184.820 |
| 4 | 51 | Nobuharu Matsushita | MAT | Japan | B-Max Racing Team | HONDA/M-TEC HR-417E | Yokohama | 53 | 1:01:43.722 | 6.394 | 1:08.026 | 13 | 184.761 |
| 5 | 6 | Tadasuke Makino | MAK | Japan | DOCOMO TEAM DANDELION RACING | HONDA/M-TEC HR-417E | Yokohama | 53 | 1:01:47.044 | 9.716 | 1:08.094 | 26 | 184.596 |
| 6 | 16 | Tomoki Nojiri | NOJ | Japan | TEAM MUGEN | HONDA/M-TEC HR-417E | Yokohama | 53 | 1:01:47.487 | 10.159 | 1:07.072 | 44 | 184.574 |
| 7 | 37 | Ritomo Miyata | MIY | Japan | Kuo VANTELIN TEAM TOM’S | TOYOTA/TRD 01F | Yokohama | 53 | 1:01:49.254 | 11.926 | 1:07.866 | 32 | 184.486 |
| 8 | 39 | Sena Sakaguchi | SAK | Japan | P.MU/CERUMO･INGING | TOYOTA/TRD 01F | Yokohama | 53 | 1:01:58.791 | 21.463 | 1:07.412 | 21 | 184.013 |
| 9 | 36 | Giuliano Alesi | ALE | France | Kuo VANTELIN TEAM TOM’S | TOYOTA/TRD 01F | Yokohama | 53 | 1:01:59.242 | 21.914 | 1:07.672 | 28 | 183.990 |
| 10 | 15 | Hiroki Otsu | OTS | Japan | Red Bull MUGEN Team Goh | HONDA/M-TEC HR-417E | Yokohama | 53 | 1:02:01.886 | 24.558 | 1:07.540 | 21 | 183.860 |
| 11 | 20 | Mitsunori Takaboshi | TAK | Japan | carenex TEAM IMPUL | TOYOTA/TRD 01F | Yokohama | 53 | 1:02:05.882 | 28.554 | 1:08.221 | 18 | 183.662 |
| 12 | 1 | Naoki Yamamoto | NAO | Japan | TCS NAKAJIMA RACING | HONDA/M-TEC HR-417E | Yokohama | 53 | 1:02:06.383 | 29.055 | 1:08.310 | 26 | 183.638 |
| 13 | 18 | Yuji Kunimoto | KUN | Japan | KCMG | TOYOTA/TRD 01F | Yokohama | 53 | 1:02:08.440 | 31.112 | 1:08.127 | 23 | 183.536 |
| 14 | 3 | Kenta Yamashita | KEN | Japan | KONDO RACING | TOYOTA/TRD 01F | Yokohama | 53 | 1:02:09.130 | 31.802 | 1:07.965 | 36 | 183.502 |
| 15 | 38 | Sho Tsuboi | TUB | Japan | P.MU/CERUMO･INGING | TOYOTA/TRD 01F | Yokohama | 53 | 1:02:27.240 | 49.912 | 1:08.727 | 29 | 182.616 |
| 16 | 12 | Koudai Tsukakoshi | TUK | Japan | ThreeBond DragoCORSE | HONDA/M-TEC HR-417E | Yokohama | 53 | 1:02:40.724 | 1:03.396 | 1:09.039 | 32 | 181.961 |
| 17 | 7 | Kazuto Kotaka | KOT | Japan | KCMG | TOYOTA/TRD 01F | Yokohama | 53 | 1:02:46.422 | 1:09.094 | 1:08.818 | 30 | 181.927 |
| 18 | 14 | Kazuya Oshima | OSH | Japan | NTT Communications ROOKIE | TOYOTA/TRD 01F | Yokohama | 52 | 1:01:38.511 | 1 lap | 1:08.873 | 21 | 181.531 |
| DNF | 4 | Yuichi Nakayama | NAK | Japan | KONDO RACING | TOYOTA/TRD 01F | Yokohama | 36 | 45:51.813 | 17 laps | 1:08.799 | 24 | 168.911 |