The 2005 FIA GT Istanbul 2 Hours was the eighth race for the 2005 FIA GT Championship season. It took place on 18 September 2005 at Istanbul Park.

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	GT1	9	Vitaphone Racing Team	Michael Bartels Timo Scheider	Maserati MC12 GT1	P	59
					Maserati 6.0L V12
2	GT1	10	Vitaphone Racing Team	Fabio Babini Thomas Biagi	Maserati MC12 GT1	P	59
					Maserati 6.0L V12
3	GT1	15	JMB Racing	Andrea Bertolini Karl Wendlinger	Maserati MC12 GT1	P	59
					Maserati 6.0L V12
4	GT1	2	GPC Sport	Jean-Denis Délétraz Andrea Piccini	Ferrari 575-GTC Maranello	P	59
					Ferrari 6.0L V12
5	GT1	6	GLPK-Carsport	Bert Longin Anthony Kumpen Mike Hezemans	Chevrolet Corvette C5-R	M	59
					Chevrolet LS7r 7.0L V8
6	GT1	11	Larbre Compétition	Gabriele Gardel Pedro Lamy	Ferrari 550-GTS Maranello	M	58
					Ferrari 5.9L V12
7	GT2	88	GruppeM Racing	Tim Sugden Emmanuel Collard	Porsche 911 GT3-RSR	M	58
					Porsche 3.6L Flat-6
8	GT2	66	GruppeM Racing	Marc Lieb Mike Rockenfeller	Porsche 911 GT3-RSR	M	58
					Porsche 3.6L Flat-6
9	GT1	16	JMB Racing	Philipp Peter Can Artam Christophe Pillon	Maserati MC12 GT1	P	58
					Maserati 6.0L V12
10	GT1	17	Russian Age Racing	Christophe Bouchut Nikolai Fomenko Alexey Vasilyev	Ferrari 550-GTS Maranello	M	57
					Ferrari 5.9L V12
11	GT2	74	Ebimotors	Luigi Moccia Emanuele Busnelli	Porsche 911 GT3-RSR	D	56
					Porsche 3.6L Flat-6
12	GT2	69	Proton Competition	Christian Ried Gerold Ried	Porsche 911 GT3-RS	D	55
					Porsche 3.6L Flat-6
13	GT2	56	Czech National Team	Jan Vonka Mauro Casadei Nicolas Armindo	Porsche 911 GT3-RS	D	54
					Porsche 3.6L Flat-6
14	GT2	57	Autoracing Club Bratislava	Miro Konopka Luigi Emiliani	Porsche 911 GT3-RSR	D	54
					Porsche 3.6L Flat-6
15	GT2	86	GPC Sport	Marco Lambertini Stéphane Lemeret	Ferrari 360 Modena GTC	P	45
					Ferrari 3.6L V8
16	GT1	14	Lister Storm Racing	Justin Keen Liz Halliday	Lister Storm GT	D	44
					Jaguar 7.0L V12
17	GT1	25	MenX	Peter Kox Robert Pergl	Ferrari 550-GTS Maranello	M	43
					Ferrari 5.9L V12
18 DNF	GT1	4	Konrad Motorsport	Franz Konrad Marco Saviozzi Maciej Marcinkiewicz	Saleen S7-R	P	12
					Ford 7.0L V8
19 DNF	GT1	5	Konrad Motorsport	Paolo Ruberti Robert Lechner	Saleen S7-R	P	9
					Ford 7.0L V8

• Pole Position – #2 GPC Sport – 1:49.611
• Fastest Lap – #10 Vitaphone Racing Team – 1:50.949
• Average Speed – 157.30 km/h

• Official Results
• Race results