The 1998 International Sports Racing Series was the second season of International Sportscar Racing Series (later known as the FIA Sportscar Championship). It was a series for sportscar-style prototypes broken into two classes based on power and weight, called SR1 and SR2, as well as a class of hillclimb-style sportscars, called CN. It began on April 13, 1998, and ended December 6, 1998, after 8 races.

Points are awarded to the top 10 finishers in the order of 20-15-12-10-8-6-4-3-2-1. Only the highest placing car within a team earned points towards the championship. The SportsRacing World Cup was available to all teams that participated, but separate SR2 and CN championships were also held.

Overall standings

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Pos	Team	Car	Engine	Rd 1	Rd 2	Rd 3	Rd 4	Rd 5	Rd 6	Rd 7	Rd 8	Total
1	JB Giesse Team Ferrari	Ferrari 333 SP	Ferrari F310E 4.0L V12		20	20	20	20	20	20		120
2	Horag-Lista Team	Ferrari 333 SP	Ferrari F310E 4.0L V12	20	8	12	15	15		15		85
3	Solution F	Riley & Scott Mk III	Ford 5.0L V8		10	15			10		20	55
4	Autosport Racing	Ferrari 333 SP	Ferrari F310E 4.0L V12	8	3	10	12	8		4		45
5	BMW Team Rafanelli	Riley & Scott Mk III	BMW 4.0L V8		15			12	15			42
6=	Target 24	Riley & Scott Mk III	Chevrolet 5.0L V8	12	6				8	12		38
6=	Tampolli Engineering	Tampolli RTA-98	Alfa Romeo 3.0L V6		4	8	10	4	6	2	4	38
8	Repsol Kremer Racing	Kremer K8 Spyder	Porsche 3.0L Turbo Flat-6	15	2	1	2			3	6	29
9	GLV Brums	Ferrari 333 SP	Ferrari F310E 4.0L V12					10		8	8	26
10	Siliprandi Racing	Lucchini P1-98	Alfa Romeo 3.0L V8			6	4	3	3			16
11	Dyson Racing	Riley & Scott Mk III	Ford 5.0L V8								15	15
12	Centenari Racing SRL	Centenari M1	Alfa Romeo 3.0L V6	10	2					1		13
13=	GTC Motorsport Lanzante	Ferrari 333 SP	Ferrari F310E 4.0L V12		12							12
13=	Waterair Sports	Debora LMP296 Debora LMP297	Cosworth 2.0L I4 BMW 3.0L I6				8		4			12
13=	Doyle-Risi Racing	Ferrari 333 SP	Ferrari F310E 4.0L V12								12	12
16	Equipe Promotion Racing	Courage C41	Porsche 3.0L Turbo Flat-6				1			10		11
17	Agusta Kremer Racing	Kremer K8 Spyder	Porsche 3.0L Turbo Flat-6			2	3		2		3	10
18	SCI	Spice SCI	Ford Cosworth 3.5L V8				6	2				8
19=	La Filière	Courage C36	Porsche 3.0L Turbo Flat-6							6		6
19=	McNeil Engineering	Lola 981	Judd GV10 3.4L V10 Judd GV4 4.0L V10					6				6
21	Cipriani Motorsport	Lucchini P3-96	Alfa Romeo 3.0L V6			3						3
22	G4 Team Gebhardt	Gebhardt G4	Audi 2.1L Turbo I5								2	2

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SR2 standings

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Pos	Team	Car	Engine	Rd 1	Rd 2	Rd 3	Rd 4	Rd 5	Rd 6	Rd 7	Rd 8	Total
1	Waterair Sports	Debora LMP296 Debora LMP297	Cosworth 2.0L I4 BMW 3.0L I6			20	20		20	20	20	100
2	Mark Bailey Racing	MBR 972	Ford 3.0L V6 MG 3.0L V6				15		12			27

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CN standings

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Pos	Team	Car	Engine	Rd 1	Rd 2	Rd 3	Rd 4	Rd 5	Rd 6	Rd 7	Rd 8	Total
1	Tampolli Engineering	Tampolli RTA-98	Alfa Romeo 3.0L V6		20	20	20	20	20	20	20	140
2=	Siliprandi Racing	Lucchini LMP1-98	Alfa Romeo 3.0L V6		10	15	15	15	15	10		80
2=	Centenari Racing SRL	Centenari M1	Alfa Romeo 3.0L V6	20	15	8	12		10	15		80
4	Cipriani Motorsport	Lucchini P3-96	Alfa Romeo 3.0L V6			10				12		22
5	Luigi Taverna	Osella PA20	BMW 3.0L I6			6			12			18
6	Osella SRL	Osella PA20	BMW 3.0L I6		8							8

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• 1998 International Sports Racing Series results