1990–91 Sheffield Shield season
| Cricket format | First-class |
|---|---|
| Tournament format(s) | Double round-robin & Final |
| Champions | Victoria (25th title) |
| Participants | 6 |
| Matches | 31 |
| Player of the series | Stuart Law (Queensland) |
| Most runs | Stuart Law (Queensland) (1082) |
| Most wickets | Paul Reiffel (Victoria) (49) |
The 1990–91 Sheffield Shield season was the 89th season of the Sheffield Shield, the domestic first-class cricket competition of Australia. Victoria won the championship.