Svjetsko prvenstvo u reliju 1990.g. bila je 18. sezona FIA Svjetskog prvenstva u reliju. Sezona se je sastojala od 12 utrka. Svjetski prvaka postao je Carlos Sainz u autombilu Toyota Celica GT-Four, ispred Didier Auriola i Juhe Kankkunena. Prvak među proizvođačima je postala je Lancia, ispred Toyote i Mitsubishija.

Utrka	Naziv utrke	Vozači na podiju
		Poredak	Vozač	Suvozač	Autmobil	Vrijeme
1.	58eme Rallye Automobile de Monte-Carlo (19. – 25. siječnja)	1.	Didier Auriol	Bernard Occelli	Lancia Delta Integrale 16V	5:56:52
		2.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	5:57:44
		3.	Miki Biasion	Tiziano Siviero	Lancia Delta Integrale 16V	6:00:31
2.	24o Rally de Portugal Vinho do Porto (6. – 10. ožujka)	1.	Miki Biasion	Tiziano Siviero	Lancia Delta Integrale 16V	6:17:57
		2.	Didier Auriol	Bernard Occelli	Lancia Delta Integrale 16V	6:20:33
		3.	Juha Kankkunen	Juha Piironen	Lancia Delta Integrale 16V	6:23:08
3.	38th Marlboro Safari Rally (11. – 16. travnja)	1.	Björn Waldegard	Fred Gallagher	Toyota Celica GT-Four	8:39:11
		2.	Juha Kankkunen	Juha Piironen	Lancia Delta Integrale 16V	9:17:23
		3.	Mikael Ericsson	Claes Billstam	Toyota Celica GT-Four	11:26:58
4.	34eme Tour de Corse - Rallye de France (6. – 9. svibnja)	1.	Didier Auriol	Bernard Occelli	Lancia Delta Integrale 16V	6:45:16
		2.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	6:45:52
		3.	François Chatriot	Michel Périn	BMW M3	6:49:05
5.	37th Acropolis Rally (3. – 6. lipnja)	1.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	7:34:44
		2.	Juha Kankkunen	Juha Piironen	Lancia Delta Integrale 16V	7:35:30
		3.	Miki Biasion	Tiziano Siviero	Lancia Delta Integrale 16V	7:37:42
6.	20th Rothmans Rally of New Zealand (30. lipnja - 3. srpnja)	1.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	6:48:26
		2.	Ingvar Carlsson	Per Carlsson	Mazda 323 4WD	6:49:57
		3.	Erwin Weber	Matthias Feltz	Volkswagen Golf Rallye G60	6:56:24
7.	10o Rally Argentina (24. – 28. srpnja)	1.	Miki Biasion	Tiziano Siviero	Lancia Delta Integrale 16V	6:51:27
		2.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	6:59:29
		3.	Didier Auriol	Bernard Occelli	Lancia Delta Integrale 16V	7:26:22
8.	40th 1000 Lakes Rally (23. – 26. kolovoza)	1.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	4:40:55
		2.	Ari Vatanen	Bruno Berglund	Mitsubishi Galant VR-4	4:41:14
		3.	Kenneth Eriksson	Staffan Parmander	Mitsubishi Galant VR-4	4:45:53
9.	3rd Commonwealth Bank Rally Australia (20. – 23. rujna)	1.	Juha Kankkunen	Juha Piironen	Lancia Delta Integrale 16V	5:43:48
		2.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	5:45:28
		3.	Alex Fiorio	Luigi Pirollo	Lancia Delta Integrale 16V	5:49:28
10.	32o Rallye Sanremo - Rallye d'Italia (14. – 18. listopada)	1.	Didier Auriol	Bernard Occelli	Lancia Delta Integrale 16V	7:30:38
		2.	Juha Kankkunen	Juha Piironen	Lancia Delta Integrale 16V	7:31:23
		3.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	7:32:23
11.	22eme Rallye Côte d'Ivoire Bandama (28, listopada - 1. studenoga)	1.	Patrick Tauziac	Claude Papin	Mitsubishi Galant VR-4	4:54:00
		2.	Rudi Stohl	Ernst Röhringer	Audi 90 Quattro	5:56:00
		3.	Alain Oreille	Michel Roissard	Renault 5 GT Turbo	6:52:00
12.	46th Lombard RAC Rally (25. – 28. studenoga)	1.	Carlos Sainz	Luis Moya	Toyota Celica GT-Four	5:43:16
		2.	Kenneth Eriksson	Staffan Parmander	Mitsubishi Galant VR-4	5:44:58
		3.	Miki Biasion	Tiziano Siviero	Lancia Delta Integrale 16V	5:47:22