| Tourney Name: | Asian Club Championship |
| Year: | 1991 |
| Dates: | August – December 1991 |
| Venues: | Doha (final stage) |
| Num Teams: | 20 |
| Champion Other: | Al-Hilal |
| Count: | 1 |
| Second Other: |  Esteghlal |
| Third Other: |  Al Rayyan |
| Fourth Other: | Al Shabab |
| Matches: | 35 |
| Goals: | 104 |
| Best Player: | Yousef Al-Thunayan |
| Prevseason: | 1990–91 |
| Nextseason: | 1992–93 |
The 1991 Asian Club Championship was the 11th edition of the annual Asian club football competition hosted by Asian Football Confederation.
Al-Hilal from Saudi Arabia won the final and became the first Asian Championship winner from Saudi Arabia.
|}
Al-Rayyan won 5–2 on aggregate. ----Al-Hilal won 4–0 on aggregate.----Al-Shabab won 4–2 on aggregate. ----1-1 on aggregate. Al-Tilal won 5–4 on penalties.----Mohammedan SC won 5–0 on aggregate.----
April 25 won 3–2 on aggregate.----
South China won 14–1 on aggregate.----
Geylang International won 4–3 on aggregate.
Note: Pelita Jaya were subsequently suspended by the AFC due to crowd disturbances during the second leg, followed by a pitch invasion following the final whistle.
|}1 Geylang International withdrew after the draw.
Esteghlal won 5–0 on aggregate.----Mohammedan SC won 5–0 on aggregate.----Yomiuri FC won 3–2 on aggregate.
Yomiuri FC withdrew.----