The 2003 Grand Prix de Trois-Rivières was the fourth race of the 2003 American Le Mans Series season. It took place at Circuit Trois-Rivières in Trois-Rivières, Quebec on August 3, 2003.

Class winners in bold. Cars failing to complete 75% of winner's distance marked as Not Classified (NC).

Pos	Class	No	Team	Drivers	Chassis	Tyre	Laps
					Engine
1	LMP900	1	Infineon Team Joest	Marco Werner Frank Biela	Audi R8	M	169
					Audi 3.6L Turbo V8
2	LMP900	38	ADT Champion Racing	Johnny Herbert JJ Lehto	Audi R8	M	169
					Audi 3.6L Turbo V8
3	LMP900	10	JML Team Panoz	Olivier Beretta David Saelens	Panoz LMP01 Evo	M	164
					Élan 6L8 6.0L V8
4	GTS	4	Corvette Racing	Kelly Collins Oliver Gavin	Chevrolet Corvette C5-R	G	162
					Chevrolet LS7-R 7.0L V8
5	GTS	3	Corvette Racing	Ron Fellows Johnny O'Connell	Chevrolet Corvette C5-R	G	162
					Chevrolet LS7-R 7.0L V8
6	LMP900	11	JML Team Panoz	Scott Maxwell Gunnar Jeannette	Panoz LMP01 Evo	M	162
					Élan 6L8 6.0L V8
7	LMP900	12	American Spirit Racing	Michael Lewis Tomy Drissi	Riley & Scott Mk III C	D	159
					Lincoln (Élan) 5.0L V8
8	GTS	0	Team Olive Garden	Emanuele Naspetti Mimmo Schiattarella	Ferrari 550 Maranello	P	157
					Ferrari 6.0L V12
9	GT	23	Alex Job Racing	Lucas Luhr Sascha Maassen	Porsche 911 GT3-RS	M	156
					Porsche 3.6L Flat-6
10	LMP675	37	Intersport Racing	Jon Field Duncan Dayton	MG-Lola EX257	G	154
					MG (AER) XP20 2.0L Turbo I4
11	LMP900	30	Intersport Racing	Clint Field Mike Durand	Lola B2K/10B	G	154
					Judd GV4 4.0L V10
12	GT	35	Risi Competizione	Anthony Lazzaro Ralf Kelleners	Ferrari 360 Modena GTC	M	153
					Ferrari 3.6L V8
13	GTS	80	Prodrive	David Brabham Jan Magnussen	Ferrari 550-GTS Maranello	M	152
					Ferrari 5.9L V12
14	GT	79	J3 Racing	David Murry Justin Jackson	Porsche 911 GT3-RS	M	152
					Porsche 3.6L Flat-6
15	GT	63	ACEMCO Motorsports	Terry Borcheller Shane Lewis	Ferrari 360 Modena GTC	Y	151
					Ferrari 3.6L V8
16	GT	33	ZIP Racing	Andy Lally Spencer Pumpelly	Porsche 911 GT3-RS	D	145
					Porsche 3.6L Flat-6
17	GT	89	Inline Cunningham Racing	Oswaldo Negri Jr. Scott Bader	Porsche 911 GT3-RS	Y	145
					Porsche 3.6L Flat-6
18	LMP675	18	Essex Racing	Melanie Paterson Jason Workman	Lola B2K/40	P	133
					Nissan (AER) VQL 3.0L V6
19	GT	43	Orbit Racing	Marc Lieb Peter Baron	Porsche 911 GT3-RS	M	131
					Porsche 3.6L Flat-6
20 DNF	GTS	88	Prodrive	Tomáš Enge Peter Kox	Ferrari 550-GTS Maranello	M	115
					Ferrari 5.9L V12
21	GT	68	The Racer's Group	Marc Bunting Chris Gleason	Porsche 911 GT3-RS	M	107
					Porsche 3.6L Flat-6
22 DNF	LMP675	56	Team Bucknum Racing	Jeff Bucknum Bryan Willman Chris McMurry	Pilbeam MP91	D	106
					Willman (JPX) 3.4L V6
23 DNF	GT	24	Alex Job Racing	Jörg Bergmeister Timo Bernhard	Porsche 911 GT3-RS	M	85
					Porsche 3.6L Flat-6
24 DNF	GT	66	The Racer's Group	Kevin Buckler Cort Wagner	Porsche 911 GT3-RS	M	70
					Porsche 3.6L Flat-6
25 DNF	LMP675	16	Dyson Racing	Butch Leitzinger James Weaver	MG-Lola EX257	G	63
					MG (AER) XP20 2.0L Turbo I4
26 DNF	GT	28	JMB Racing USA	Stéphane Grégoire Eliseo Salazar Christian Pescatori	Ferrari 360 Modena GTC	P	56
					Ferrari 3.6L V8
27 DNF	GT	61	P.K. Sport	Spencer Trenery Vic Rice	Porsche 911 GT3-R	P	54
					Porsche 3.6L Flat-6
28 DNF	GT	60	P.K. Sport	Robin Liddell Alex Davison	Porsche 911 GT3-RS	P	50
					Porsche 3.6L Flat-6
29 DNF	GT	67	The Racer's Group	Michael Schrom Jean-François Dumoulin	Porsche 911 GT3-RS	M	5
					Porsche 3.6L Flat-6
30 DNF	LMP675	20	Dyson Racing	Chris Dyson Andy Wallace	MG-Lola EX257	G	1
					MG (AER) XP20 2.0L Turbo I4
DNS	GT	03	Hyper Sport	Joe Foster Brad Nyberg Rick Skelton	Panoz Esperante GT-LM	P	-
					Élan 5.0L V8

• Pole Position - #1 Infineon Team Joest - 0:57.740
• Fastest Lap - #1 Infineon Team Joest - 0:59.265
• Distance - 413.680 km
• Average Speed - 137.808 km/h

• "Official Results" (PDF). Archived from the original (PDF) on 2007-09-29. Retrieved 2007-08-19. (436 KiB)
• Race Results