The 2005 Grand Prix of Sonoma was the fifth race for the 2005 American Le Mans Series season, held at Infineon Raceway. It took place on July 17, 2005. It was the last ALMS race held at Infineon. It was the final ALMS race held at Sonoma, the event being transferred to the Rolex Sports Car Series the following year.

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	2	ADT Champion Racing	Frank Biela Emanuele Pirro	Audi R8	M	111
					Audi 3.6L Turbo V8
2	LMP1	20	Dyson Racing	Chris Dyson Andy Wallace	MG-Lola EX257	M	111
					MG (AER) XP20 2.0L Turbo I4
3	LMP1	1	ADT Champion Racing	Marco Werner JJ Lehto	Audi R8	M	110
					Audi 3.6L Turbo V8
4	LMP2	37	Intersport Racing	Clint Field Liz Halliday	Lola B05/40	G	105
					AER P07 2.0L Turbo I4
5	LMP1	16	Dyson Racing	Butch Leitzinger James Weaver	MG-Lola EX257	M	105
					MG (AER) XP20 2.0L Turbo I4
6	LMP2	10	Miracle Motorsports	Jeff Bucknum Chris McMurry	Courage C65	K	105
					AER P07 2.0L Turbo I4
7	GT1	3	Corvette Racing	Ron Fellows Johnny O'Connell	Chevrolet Corvette C6.R	M	104
					Chevrolet 7.0L V8
8	GT1	4	Corvette Racing	Oliver Gavin Olivier Beretta	Chevrolet Corvette C6.R	M	104
					Chevrolet 7.0L V8
9	GT1	63	ACEMCO Motorsports	Terry Borcheller Johnny Mowlem	Saleen S7-R	M	104
					Ford 7.0L V8
10	LMP2	8	B-K Motorsport	Guy Cosmo James Bach	Courage C65	G	102
					Mazda R20B 2.0L 3-Rotor
11	GT1	35	Maserati Corse Risi Competizione	Andrea Bertolini Fabrizio de Simone	Maserati MC12	P	102
					Maserati 6.0L V12
12	GT2	23	Alex Job Racing	Timo Bernhard Romain Dumas	Porsche 911 GT3-RSR	M	100
					Porsche 3.6L Flat-6
13	GT2	31	Petersen Motorsports White Lightning Racing	Jörg Bergmeister Patrick Long	Porsche 911 GT3-RSR	M	99
					Porsche 3.6L Flat-6
14	GT2	43	BAM!	Mike Rockenfeller Wolf Henzler	Porsche 911 GT3-RSR	Y	99
					Porsche 3.6L Flat-6
15	GT2	45	Flying Lizard Motorsports	Johannes van Overbeek Jon Fogarty	Porsche 911 GT3-RSR	M	98
					Porsche 3.6L Flat-6
16	GT2	50	Panoz Motor Sports	Bill Auberlen Robin Liddell	Panoz Esperante GT-LM	P	98
					Ford (Elan) 5.0L V8
17	GT2	79	J3 Racing	Justin Jackson Tim Sugden	Porsche 911 GT3-RSR	P	97
					Porsche 3.6L Flat-6
18	GT2	44	Flying Lizard Motorsports	Lonnie Pechnik Seth Neiman	Porsche 911 GT3-RSR	M	96
					Porsche 3.6L Flat-6
19	GT2	24	Alex Job Racing	Ian Baas Randy Pobst	Porsche 911 GT3-RSR	M	96
					Porsche 3.6L Flat-6
20 DNF	GT1	71	Carsport America	Michele Rumolo Tom Weickardt	Dodge Viper GTS-R	P	80
					Dodge 8.0L V10
21 DNF	GT1	5	Pacific Coast Motorsports	Alex Figge Ryan Dalziel	Chevrolet Corvette C5-R	Y	78
					Chevrolet 7.0L V8
22 DNF	GT2	78	J3 Racing	Pierre Ehret David Murry	Porsche 911 GT3-RSR	P	47
					Porsche 3.6L Flat-6
23 DNF	GT2	51	Panoz Motor Sports	Bryan Sellers Marino Franchitti	Panoz Esperante GT-LM	P	39
					Ford (Elan) 5.0L V8
24 DNF	LMP1	12	Autocon Motorsports	Bryan Willman Michael Lewis	Riley & Scott Mk III C	D	5
					Elan 6L8 6.0L V8

• Pole Position - #20 Dyson Racing - 1:21.688
• Fastest Lap - #1 ADT Champion Racing - 1:22.041
• Distance - 280.83 miles (451.95 km)
• Average Speed - 101.395 mph (163.179 km/h)

• "Official Results" (PDF). Archived from the original (PDF) on 2006-11-10. Retrieved 2006-11-03. (50.9 KiB)