The 1981 King's Cup was the 23rd season of the knockout competition since its establishment in 1956. Al-Hilal were the defending champions but were defeated by Al-Nassr in the final. Al-Nassr won their 3rd title overall and first since 1976.[1][2]
The four winners of the quarter-finals progressed to the semi-finals. The semi-finals were played on 7 and 8 May 1981. All times are local, AST (UTC+3).
The final was played between Al-Nassr and Al-Hilal in the Youth Welfare Stadium in Riyadh.[13][14] This was Al-Nassr's 6th final and Al-Hilal's 7th final. This was the first meeting between these sides in King Cup finals.