| Event: | Rugby union |
| Games: | 1966 South Pacific Games |
| Venue: | Nouméa, New Caledonia |
| Dates: | December |
| Nations: | 4 |
| Prev: | 1963 |
| Next: | 1969 |
Rugby union at the 1966 South Pacific Games was played as a round-robin tournament with 4 men's teams competing. No finals were played and the teams finishing in the top three positions were awarded medals. Papua New Guinea, captained by Peter Emery, won the gold medal and were unbeaten in the tournament.
| Men's rugby 15s | align=center | align=center | align=center |
Final standings after the round robin tournament:
| width=200 | Team | width=20 | Pld | width=20 | W | width=20 | D | width=20 | L | width=30 | PF | width=30 | PA | width=30 | PD | width=20 | Pts |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| align=left | 3 | 3 | 0 | 0 | 135 | 8 | 127 | 6 | |||||||||
| align=left | 3 | 2 | 0 | 1 | 39 | 47 | -8 | 4 | |||||||||
| align=left | 3 | 1 | 0 | 2 | 16 | 62 | -46 | 2 | |||||||||
| align=left | 3 | 0 | 0 | 3 | 11 | 84 | -73 | 0 |
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