The 2003 Formula Nippon Championship was contested over 10 rounds. 10 different teams and 21 different drivers competed. All teams had to use Lola chassis (Lola B03/51) and Mugen Honda (Mugen MF308) engines.

Team	#	Driver	Chassis	Engine	Rounds
PIAA Nakajima Racing	1	Takashi Kogure	Lola B03/51	Mugen MF308	All
	2	André Lotterer			All
Olympic Kondo Racing Team	3	Yuji Tachikawa	Lola B03/51	Mugen MF308	All
	4	Dominik Schwager			All
Team 5ZIGEN	5	Ryo Michigami	Lola B03/51	Mugen MF308	All
	6	Ryo Fukuda			1–5
		James Courtney			7–10
Forum Engineering ARTA Team LeMans	7	Toshihiro Kaneishi	Lola B03/51	Mugen MF308	All
	8	Takeshi Tsuchiya			All
Planex EBBRO Nova Kacchao TCPRO Nova Team Nova Oizumi Team Nova	9	Haruki Kurosawa	Lola B03/51	Mugen MF308	All
	10	Tetsuya Fujisawa			1–4
		Yudai Igarashi			5–7
		Hiroki Katoh			8–10
Cosmo Oil Racing Team Cerumo	11	Tsugio Matsuda	Lola B03/51	Mugen MF308	All
	12	Yuji Ide			All
Team Impul	19	Satoshi Motoyama	Lola B03/51	Mugen MF308	All
	20	Benoît Tréluyer			All
Team 22	22	Juichi Wakisaka	Lola B03/51	Mugen MF308	All
Carrozzerria Team MOHN	28	Hideki Noda	Lola B03/51	Mugen MF308	All
DoCoMo Team Dandelion Racing	40	Richard Lyons	Lola B03/51	Mugen MF308	All
	41	Naoki Hattori			All

All races were held in Japan

Race	Track	Date	Pole Position	Fastest Race Lap	Winning Driver	Winning Team
1	Suzuka Circuit	23 March	Ryo Michigami	Richard Lyons	Satoshi Motoyama	Team Impul
2	Fuji Speedway	6 April	Satoshi Motoyama	Takeshi Tsuchiya	Satoshi Motoyama	Team Impul
3	Mine Circuit	27 April	Satoshi Motoyama	Yuji Tachikawa	Satoshi Motoyama	Team Impul
4	Twin Ring Motegi	8 June	Juichi Wakisaka	Satoshi Motoyama	Juichi Wakisaka	Team 22
5	Suzuka Circuit	6 July	Richard Lyons	Satoshi Motoyama	Richard Lyons	DoCoMo Team Dandelion Racing
6	Sportsland SUGO	27 July	André Lotterer	Satoshi Motoyama	Satoshi Motoyama	Team Impul
7	Fuji Speedway	31 August	Satoshi Motoyama	Satoshi Motoyama	Benoît Tréluyer	Team Impul
8	Mine Circuit	21 September	Satoshi Motoyama	Satoshi Motoyama	Benoît Tréluyer	Team Impul
9	Twin Ring Motegi	19 October	Toshihiro Kaneishi	Takeshi Tsuchiya	Toshihiro Kaneishi	Forum Engineering ARTA Team LeMans
10	Suzuka Circuit	2 November	Satoshi Motoyama	Richard Lyons	Juichi Wakisaka	Team 22

• At race 5 a sprint race of 18 laps (104.526 km) set the grid for the main race. The sprint race winner Richard Lyons started from pole in the main race. Takeshi Tsuchiya set pole position for the sprint race.

Scoring system

Rank	Name	SUZ	FUJ	MIN	MOT	SUZ	SGO	FUJ	MIN	MOT	SUZ	Points
1	Satoshi Motoyama	1	1	1	9	14	1	2	13	2	3	56
2	Benoît Tréluyer	Ret	2	Ret	NC	2	4	1	1	9	Ret	35
3	Juichi Wakisaka	Ret	5	Ret	1	3	3	Ret	6	Ret	1	31
4	Toshihiro Kaneishi	3	8	5	7	Ret	8	Ret	2	1	Ret	22
5	André Lotterer	2	4	7	6	Ret	2	3	9	5	Ret	22
6	Richard Lyons	9	Ret	Ret	3	1	5	Ret	Ret	3	9	20
7	Yuji Ide	4	7	3	2	7	10	Ret	3	12	5	19
8	Takeshi Tsuchiya	Ret	NC	2	4	5	7	6	12	6	4	16
9	Ryo Michigami	Ret	3	4	5	4	NC	Ret	NC	13	6	13
10	Takashi Kogure	12	6	Ret	DNS	6	Ret	Ret	14	4	2	11
11	Tsugio Matsuda	5	9	Ret	Ret	15	6	5	5	14	Ret	7
12	James Courtney							4	7	Ret	Ret	3
13	Naoki Hattori	8	Ret	Ret	11	8	9	9	4	7	11	3
14	Hideki Noda	6	10	8	DNS	12	Ret	Ret	10	Ret	10	1
15	Ryo Fukuda	7	Ret	6	Ret	13						1
16	Dominik Schwager	Ret	Ret	Ret	8	9	11	7	8	10	8	0
17	Hiroki Katoh								Ret	11	7	0
18	Yuji Tachikawa	10	12	10	Ret	Ret	NC	Ret	Ret	8	Ret	0
19	Haruki Kurosawa	Ret	Ret	9	10	11	Ret	Ret	11	Ret	Ret	0
20	Yudai Igarashi					10	12	Ret				0
21	Tetsuya Fujisawa	11	11	Ret	12							0

• 2003 Japanese Championship Formula Nippon