| 1990 State of Origin series | |
|---|---|
| Won by |  New South Wales (3rd title) |
| Series margin | 2 - 1 |
| Points scored | 50 |
| Attendance | 98,451 (ave. 32,817 per match) |
| Top points scorer(s) |  Gary Belcher (8) |
| Top try scorer(s) | Mark McGaw (2) |
The 1990 State of Origin series saw the ninth time that the annual three-game series between New South Wales and Queensland representative rugby league football teams was contested entirely under "state of origin" selection rules. It was the first year that the Australian Rugby League took an Origin match to Melbourne to showcase the code in Victoria. New South Wales broke an eight-game losing streak in game I and took the series for the first time since 1986.