The 1990–91 Asian Club Championship was the 10th edition of the annual Asian club football competition hosted by Asian Football Confederation.
Representative clubs of 30 Asian countries played games in this tournament.
Esteghlal FC from Iran won the final and became Asian champions for the second time (They are championed in 1970 as Taj)
The Gulf Cooperation Council Club Tournament was cancelled due to the crisis in the region; the participants would have been Bahrain Club, Al-Arabi, Al-Nassr and Al-Sharjah, who all withdrew.
Al Rasheed (Iraq) withdrew due to the Gulf War, and were replaced by Al Ramtha (Jordan), who were disqualified for not paying the second round entry fee.