The 1990 King Cup was the 32nd season of the knockout competition since its establishment in 1956. Al-Hilal were the defending champions but they were eliminated by Al-Riyadh in the Round of 16.[1] This season was the final season of the competition. The King Cup then returned under the name of King Cup of Champions in 2008.[2]
The four winners of the quarter-finals progressed to the semi-finals. The semi-finals were played on 17 and 18 May 1990. All times are local, AST (UTC+3).
The final was played between Al-Nassr and Al-Taawoun in the Youth Welfare Stadium in Jeddah.[10] Al-Nassr were appearing in their 10th final while Al-Taawoun reached the final for the first time.