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 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 OccelliLancia Delta Integrale 16V5:56:522. Carlos Sainz Luis MoyaToyota Celica GT-Four 5:57:443. Miki Biasion Tiziano SivieroLancia Delta Integrale 16V6:00:31 2. 24o Rally de Portugal Vinho do Porto(6. – 10. ožujka) 1. Miki Biasion Tiziano SivieroLancia Delta Integrale 16V6:17:572. Didier Auriol Bernard OccelliLancia Delta Integrale 16V6:20:333. Juha Kankkunen Juha PiironenLancia Delta Integrale 16V6:23:08 3. 38th Marlboro Safari Rally(11. – 16. travnja) 1. Björn Waldegard Fred GallagherToyota Celica GT-Four8:39:112. Juha Kankkunen Juha PiironenLancia Delta Integrale 16V9:17:233. Mikael Ericsson Claes BillstamToyota Celica GT-Four11:26:58 4. 34eme Tour de Corse - Rallye de France(6. – 9. svibnja) 1. Didier Auriol Bernard OccelliLancia Delta Integrale 16V6:45:162. Carlos Sainz Luis MoyaToyota Celica GT-Four6:45:523. François Chatriot Michel PérinBMW M36:49:05 5. 37th Acropolis Rally(3. – 6. lipnja)1. Carlos Sainz Luis MoyaToyota Celica GT-Four7:34:442. Juha Kankkunen Juha PiironenLancia Delta Integrale 16V7:35:303. Miki Biasion Tiziano SivieroLancia Delta Integrale 16V7:37:42 6. 20th Rothmans Rally of New Zealand(30. lipnja - 3. srpnja)1. Carlos Sainz Luis MoyaToyota Celica GT-Four6:48:262. Ingvar Carlsson Per CarlssonMazda 323 4WD6:49:573. Erwin Weber Matthias FeltzVolkswagen Golf Rallye G606:56:24 7. 10o Rally Argentina(24. – 28. srpnja)1. Miki Biasion Tiziano SivieroLancia Delta Integrale 16V6:51:272. Carlos Sainz Luis MoyaToyota Celica GT-Four6:59:293. Didier Auriol Bernard OccelliLancia Delta Integrale 16V7:26:22 8. 40th 1000 Lakes Rally(23. – 26. kolovoza)1. Carlos Sainz Luis MoyaToyota Celica GT-Four4:40:552. Ari Vatanen Bruno BerglundMitsubishi Galant VR-44:41:143. Kenneth Eriksson Staffan ParmanderMitsubishi Galant VR-44:45:53 9. 3rd Commonwealth Bank Rally Australia(20. – 23. rujna)1. Juha Kankkunen Juha PiironenLancia Delta Integrale 16V5:43:482. Carlos Sainz Luis MoyaToyota Celica GT-Four5:45:283. Alex Fiorio Luigi PirolloLancia Delta Integrale 16V5:49:28 10. 32o Rallye Sanremo - Rallye d'Italia(14. – 18. listopada)1. Didier Auriol Bernard OccelliLancia Delta Integrale 16V7:30:382. Juha Kankkunen Juha PiironenLancia Delta Integrale 16V7:31:233. Carlos Sainz Luis MoyaToyota Celica GT-Four7:32:23 11. 22eme Rallye Côte d'Ivoire Bandama(28, listopada - 1. studenoga)1. Patrick Tauziac Claude PapinMitsubishi Galant VR-44:54:002. Rudi Stohl Ernst RöhringerAudi 90 Quattro5:56:003. Alain Oreille Michel RoissardRenault 5 GT Turbo6:52:00 12. 46th Lombard RAC Rally(25. – 28. studenoga)1. Carlos Sainz Luis MoyaToyota Celica GT-Four5:43:162. Kenneth Eriksson Staffan ParmanderMitsubishi Galant VR-45:44:583. Miki Biasion Tiziano SivieroLancia Delta Integrale 16V5:47:22
1990