The Bosch Sports Car Oktoberfest was the ninth round of the 1999 FIA GT Championship season. It took place at Watkins Glen International, New York, United States, on October 3, 1999.

As with the previous FIA GT event, this race was originally intended to share the weekend with a United States Road Racing Championship event. However, the USRRC championship was cancelled midway through the season, leaving the FIA GT Championship to run on their own. In order to increase the number of participants for the FIA GT event, as well as to allow USRRC teams to compete, a National GT (N-GT) designation was used for cars which had run in the USRRC's GT2 and GT3 classes. Cars running in the N-GT class would not be eligible for points in the FIA GT Championship.

This race would also be the last time that the FIA GT Championship would run in North America.

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

Pos	Class	No	Team	Drivers	Chassis	Tyre	Laps
					Engine
1	GT	2	Viper Team Oreca	Jean-Philippe Belloc David Donohue	Chrysler Viper GTS-R	M	93
					Chrysler 8.0L V10
2	GT	1	Viper Team Oreca	Olivier Beretta Karl Wendlinger	Chrysler Viper GTS-R	M	93
					Chrysler 8.0L V10
3	GT	19	Chamberlain Motorsport	Christian Vann Christian Gläsel	Chrysler Viper GTS-R	M	92
					Chrysler 8.0L V10
4	GT	15	Freisinger Motorsport	Bob Wollek Wolfgang Kaufmann	Porsche 911 GT2	D	91
					Porsche 3.6L Turbo Flat-6
5	GT	21	Paul Belmondo Racing	Paul Belmondo Luca Drudi	Chrysler Viper GTS-R	D	91
					Chrysler 8.0L V10
6	GT	18	Chamberlain Motorsport	Xavier Pompidou Michel Ligonnet Vincent Vosse	Chrysler Viper GTS-R	M	91
					Chrysler 8.0L V10
7	N-GT	17	Schumacher Racing	Larry Schumacher John O'Steen	Porsche 911 GT2	M	90
					Porsche 3.6L Turbo Flat-6
8	GT	22	Paul Belmondo Racing	Steve Pfeffer "Rael"	Chrysler Viper GTS-R	D	90
					Chrysler 8.0L V10
9	GT	16	Freisinger Motorsport	Manfred Jurasz Yukihiro Hane	Porsche 911 GT2	D	86
					Porsche 3.6L Turbo Flat-6
10	N-GT	46	Reiser Callas Rennsport	Joel Reiser David Murry	Porsche 911 Carrera RSR	?	86
					Porsche 3.8L Flat-6
11	GT	9	Elf Haberthur Racing	Mauro Casadei Andrea Garbagnati	Porsche 911 GT2	D	85
					Porsche 3.6L Turbo Flat-6
12	GT	8	Elf Haberthur Racing	Luca Cappellari Patrick Vuillaume David Kicak	Porsche 911 GT2	D	83
					Porsche 3.6L Turbo Flat-6
13	N-GT	84	Jeff Nowicki Specter Werks	Jeff Nowicki Andy Pilgrim	Chevrolet Corvette C5	?	83
					Chevrolet 5.7L V8
14	N-GT	44	John Fergus Dick Greer Racing	John Fergus Dick Greer	Oldsmobile Cutlass Supreme	?	83
					Oldsmobile V8
15	GT	6	Konrad Motorsport	Franz Konrad Mike Hezemans	Porsche 911 GT2	D	78
					Porsche 3.6L Turbo Flat-6
16	N-GT	52	Glenn Seward Extreme Motor Racing	Glenn Seward David Galpin James Yeames	Chevrolet Corvette C4	?	72
					Chevrolet V8
17	N-GT	53	Michael Jacobs Jacobs Motorsports	Richard Geck Frank Del Vecchio	Ford Mustang Cobra R	?	62
					Ford 5.8L V8
18	GT	7	Konrad Motorsport	Charles Slater Jesús Diez de Villarroel	Porsche 911 GT2	D	48
					Porsche 3.6L Turbo Flat-6
19	N-GT	54	Michael Jacobs Jacobs Motorsports	Michael Jacobs Paul Hacker	Ford Mustang Cobra R	?	20
					Ford 5.8L V8
20 DNF	N-GT	47	Paragon Motorsports	Keith Fisher Scott Brunk	Porsche 964 Carrera Cup	P	8
					Porsche 3.6L Flat-6
21 DNF	N-GT	45	SSZ Motorcars	Mark Knepper William Collins	SSZ Stradale Mk.III	?	4
					Nissan 3.0L Turbo V6

• Pole position – #2 Viper Team Oreca – 1:47.576
• Fastest lap – #2 Viper Team Oreca – 1:47.717
• Average speed – 171.297 km/h