The 2004 Toronto Grand Prix of Mosport was an American Le Mans Series professional sports car race held at Mosport International Raceway near Bowmanville, Ontario, Canada from August 6 to the 8, 2004. It was the sixth race of the 2004 American Le Mans Series season and the 19th IMSA sanctioned sports car race held at the facility.

The LMP1 and overall race victory went to Dyson Racing drivers Butch Leitzinger and James Weaver for their first victory of the season in the MG-Lola EX257. After winning the previous four rounds, ADT Champion Racing drivers Marco Werner and JJ Lehto finished second in the Audi R8, with the second Dyson Racing entry of Chris Dyson and Andy Wallace finishing third.

The GTS class win went to Corvette Racing's Oliver Gavin and Olivier Beretta in the Chevrolet Corvette C5-R, with Intersport Racing's Clint Field and Robin Liddell taking the LMP2 victory in the Lola B2K/40. Alex Job Racing drivers Jörg Bergmeister and Timo Bernhard won the GT class in a Porsche 911 GT3-RSR.^[1]

The race was broadcast across North America on CBS Sports with Ralph Sheheen and Bill Adam calling the race.

Class winners in bold. Cars failing to complete 70% of winner's distance marked as Not Classified (NC).

Pos	Class	No	Team	Drivers	Chassis	Tyre	Laps
					Engine
1	LMP1	16	Dyson Racing	Butch Leitzinger James Weaver	MG-Lola EX257	G	137
					MG (AER) XP20 2.0L Turbo I4
2	LMP1	38	ADT Champion Racing	Marco Werner JJ Lehto	Audi R8	M	137
					Audi 3.6L Turbo V8
3	LMP1	20	Dyson Racing	Chris Dyson Andy Wallace	MG-Lola EX257	G	135
					MG (AER) XP20 2.0L Turbo I4
4	GTS	4	Corvette Racing	Oliver Gavin Olivier Beretta	Chevrolet Corvette C5-R	M	129
					Chevrolet 7.0L V8
5	GTS	3	Corvette Racing	Ron Fellows Johnny O'Connell	Chevrolet Corvette C5-R	M	129
					Chevrolet 7.0L V8
6	LMP2	30	Intersport Racing	Clint Field Robin Liddell	Lola B2K/40	P	127
					Judd KV675 3.4L V8
7	GTS	63	ACEMCO Motorsports	Terry Borcheller Johnny Mowlem	Saleen S7-R	P	125
					Ford 7.0L V8
8	GT	23	Alex Job Racing	Jörg Bergmeister Timo Bernhard	Porsche 911 GT3-RSR	M	120
					Porsche 3.6L Flat-6
9	GT	31	White Lightning Racing	David Murry Craig Stanton	Porsche 911 GT3-RSR	M	120
					Porsche 3.6L Flat-6
10	GT	45	Flying Lizard Motorsports	Johannes van Overbeek Darren Law	Porsche 911 GT3-RSR	M	120
					Porsche 3.6L Flat-6
11	GT	35	Risi Competizione	Anthony Lazzaro Ralf Kelleners	Ferrari 360 Modena GTC	P	119
					Ferrari 3.6L V8
12	GT	66	New Century – The Racer's Group	Patrick Long Cort Wagner	Porsche 911 GT3-RSR	M	119
					Porsche 3.6L Flat-6
13	GT	44	Flying Lizard Motorsports	Lonnie Pechnik Seth Neiman	Porsche 911 GT3-RSR	M	118
					Porsche 3.6L Flat-6
14	GT	79	J-3 Racing	Justin Jackson Tim Sugden	Porsche 911 GT3-RSR	M	117
					Porsche 3.6L Flat-6
15	GT	50	Panoz Motor Sports	Gunnar Jeannette David Saelens	Panoz Esperante GT-LM	P	116
					Ford (Elan) 5.0L V8
16	GT	43	BAM!	Leo Hindery Sascha Maassen	Porsche 911 GT3-RSR	M	116
					Porsche 3.6L Flat-6
17	GTS	71	Carsport America	Tom Weickardt Jean-Philippe Belloc	Dodge Viper GTS-R	P	116
					Dodge 8.0L V10
18	GT	60	P.K. Sport	Tony Burgess Piers Masarati	Porsche 911 GT3-RS	P	116
					Porsche 3.6L Flat-6
19	LMP2	10	Miracle Motorsports	Ian James James Gue John Macaluso	Lola B2K/40	Y	111
					Nissan (AER) 3.0L V6
20	GT	24	Alex Job Racing	Marc Lieb Romain Dumas	Porsche 911 GT3-RSR	M	96
					Porsche 3.6L Flat-6
21 DNF	LMP1	37	Intersport Racing	Jon Field Niclas Jönsson	Lola B01/60	G	17
					Judd KV675 3.4L V8
FINAL RACE RESULTS Archived 2014-05-30 at the Wayback Machine[2]

• Pole position – #16 Dyson Racing - 1:07.430
• Fastest lap – #16 Dyson Racing - 1:09.088
• Distance – 336.883 miles (542.161 km)
• Average speed – 122.065 mph (196.445 km/h)

• "Official Results" (PDF). Archived from the original (PDF) on May 30, 2014. Retrieved May 29, 2014. (39.8 KiB)

• 2004 Grand Prix of Mosport Race Broadcast (American Le Mans Series YouTube Channel)