The 2005 Petit Le Mans was the ninth race for the 2005 American Le Mans Series season held at Road Atlanta. It took place on October 1, 2005.

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	394
					Audi 3.6L Turbo V8
2	LMP1	20	Dyson Racing	Chris Dyson Guy Smith	MG-Lola EX257	M	382
					MG (AER) XP20 2.0L Turbo I4
3	GT1	4	Corvette Racing	Oliver Gavin Olivier Beretta Jan Magnussen	Chevrolet Corvette C6.R	M	379
					Chevrolet 7.0L V8
4	GT1	57	Aston Martin Racing	David Brabham Darren Turner Jonny Kane	Aston Martin DBR9	M	378
					Aston Martin 6.0L V12
5	LMP2	37	Intersport Racing	Jon Field Clint Field Liz Halliday	Lola B05/40	G	375
					AER P07 2.0L Turbo I4
6	GT1	63	ACEMCO Motorsports	Terry Borcheller Johnny Mowlem Ralf Kelleners	Saleen S7-R	M	373
					Ford 7.0L V8
7	LMP1	1	ADT Champion Racing	Marco Werner JJ Lehto	Audi R8	M	372
					Audi 3.6L Turbo V8
8	GT1	35	Maserati Corse Risi Competizione	Andrea Bertolini Fabio Babini Fabrizio de Simone	Maserati MC12	P	371
					Maserati 6.0L V12
9	GT2	31	Petersen Motorsports White Lightning Racing	Patrick Long Jörg Bergmeister	Porsche 911 GT3-RSR	M	364
					Porsche 3.6L Flat-6
10	GT2	24	Alex Job Racing	Ian Baas Marcel Tiemann Emmanuel Collard	Porsche 911 GT3-RSR	M	363
					Porsche 3.6L Flat-6
11	GT1	58	Aston Martin Racing	Pedro Lamy Tomáš Enge Peter Kox	Aston Martin DBR9	M	359
					Aston Martin 6.0L V12
12	GT1	3	Corvette Racing	Ron Fellows Johnny O'Connell Max Papis	Chevrolet Corvette C6.R	M	357
					Chevrolet 7.0L V8
13	GT2	45	Flying Lizard Motorsports	Johannes van Overbeek Jon Fogarty Darren Law	Porsche 911 GT3-RSR	M	356
					Porsche 3.6L Flat-6
14	LMP2	8	B-K Motorsports	Guy Cosmo Jamie Bach Elliot Forbes-Robinson	Courage C65	G	354
					Mazda R20B 2.0L 3-Rotor
15	LMP1	12	Autocon Motorsports	Michael Lewis Bryan Willman	Riley & Scott Mk III C	D	350
					Elan 6L8 6.0L V8
16	LMP2	7	BAT Competition	Bob Woodman Mike Johnson Georges Forgeois	Lola B2K/40	Y	350
					Nissan (AER) 3.0L V6
17	GT2	23	Alex Job Racing	Timo Bernhard Romain Dumas	Porsche 911 GT3-RSR	M	349
					Porsche 3.6L Flat-6
18	GT2	43	BAM!	Mike Rockenfeller Wolf Henzler Martin Jensen	Porsche 911 GT3-RSR	Y	343
					Porsche 3.6L Flat-6
19	GT2	79	J3 Racing	Justin Jackson Niclas Jönsson Tim Sugden	Porsche 911 GT3-RSR	P	324
					Porsche 3.6L Flat-6
20	GT1	71	Carsport America	Michele Rugolo Tom Weickardt Jean-Philippe Belloc	Dodge Viper GTS-R	P	304
					Dodge 8.0L V10
21 NC	GT2	51	Panoz Motor Sports	Bryan Sellers Marino Franchitti Gunnar Jeannette	Panoz Esperante GT-LM	P	258
					Ford (Elan) 5.0L V8
22 DNF	GT2	78	J3 Racing	Michael Cawley Leh Keen Andy Burgess	Porsche 911 GT3-RS	P	253
					Porsche 3.6L Flat-6
23 DNF	LMP2	30	Barazi-Kruse Motorsport	Juan Barazi Philipp Bennett Elton Julian	Courage C65	P	225
					AER P07 2.0L Turbo I4
24 DNF	LMP2	10	Miracle Motorsports	Jeff Bucknum Chris McMurry James Gue	Courage C65	K	197
					AER P07 2.0L Turbo I4
25 DNF	LMP2	41	Binnie Motorsports	William Binnie Alan Timpany Sam Hancock	Lola B05/40	P	195
					Nicholson-McLaren 3.3L V8
26 DNF	LMP1	16	Dyson Racing	Butch Leitzinger Andy Wallace James Weaver	MG-Lola EX257	M	164
					MG (AER) XP20 2.0L Turbo I4
27 NC	GT2	50	Panoz Motor Sports	Bill Auberlen Robin Liddell Scott Maxwell	Panoz Esperante GT-LM	P	90
					Ford (Elan) 5.0L V8
28 DNF	GT2	44	Flying Lizard Motorsports	Lonnie Pechnik Seth Neiman David Murry	Porsche 911 GT3-RSR	M	89
					Porsche 3.6L Flat-6
29 DNF	LMP2	19	Van der Steur Racing	Gunnar van der Steur Eric van der Steur Ben Devlin	Lola B2K/40	D	7
					Nissan (AER) 3.0L V6
30 DNF	LMP1	15	Zytek Engineering	Tom Chilton Hayanari Shimoda	Zytek 04S	M	0
					Zytek ZG348 3.4L V8

• Pole Position - #15 Zytek Engineering - 1:10.781
• Fastest Lap - #1 ADT Champion Racing - 1:12.958
• Average Speed - 107.929 mph (173.695 km/h)

• "Official Results" (PDF). Archived from the original (PDF) on November 10, 2006. Retrieved November 6, 2006. (47.4 KiB)