| 1990 Pacific Cup | |
|---|---|
| Number of teams | 8 |
| Host country |  Tonga |
| Winner |  Western Samoa (1st title) |
| Matches played | 15 |
< 1988 1992 > | |
The 1990 Pacific Cup was the fifth edition of the Pacific Cup, a rugby league tournament held between Pacific teams. The tournament was hosted by Tonga and eventually won by Western Samoa, who defeated New Zealand Māori 26–18 in the final, a replay of the 1988 final.