The 2005 season was the 30th and final year of the National Provincial Championship (NPC), a provincial rugby union competition in New Zealand, in its original format. Auckland were the winners of Division 1, Hawke's Bay were the winners of Division 2, and Wairarapa Bush were the winners of Division 3.
| Pos | Team | Pld | W | D | L | PF | PA | PD | TF | TA | TB | LB | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Canterbury – RS | 9 | 7 | 1 | 1 | 234 | 138 | +94 | 25 | 14 | 4 | 1 | 35 | |
| 2 | Auckland | 9 | 7 | 0 | 2 | 290 | 219 | +71 | 32 | 28 | 5 | 0 | 33 | |
| 3 | North Harbour | 9 | 6 | 1 | 2 | 280 | 158 | +122 | 34 | 16 | 6 | 0 | 32 | |
| 4 | Otago | 9 | 6 | 0 | 3 | 218 | 145 | +73 | 24 | 16 | 3 | 1 | 28 | |
| 5 | Wellington | 9 | 5 | 0 | 4 | 268 | 204 | +64 | 32 | 22 | 4 | 2 | 26 | |
| 6 | Southland | 9 | 4 | 0 | 5 | 200 | 256 | –56 | 20 | 31 | 1 | 2 | 19 | |
| 7 | Waikato | 9 | 4 | 0 | 5 | 203 | 199 | +4 | 23 | 20 | 1 | 1 | 18 | |
| 8 | Bay of Plenty | 9 | 3 | 0 | 6 | 188 | 241 | −53 | 23 | 25 | 3 | 2 | 17 | |
| 9 | Taranaki | 9 | 2 | 0 | 7 | 164 | 215 | −51 | 20 | 20 | 2 | 3 | 13 | |
| 10 | Northland | 9 | 0 | 0 | 9 | 97 | 367 | −270 | 11 | 52 | 0 | 1 | 1 |
| Pos | Team | Pld | W | D | L | PF | PA | PD | TF | TA | TB | LB | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Hawke's Bay | 8 | 8 | 0 | 0 | 362 | 117 | +245 | 54 | 16 | 8 | 0 | 40 | |
| 2 | Counties Manukau | 8 | 7 | 0 | 1 | 320 | 162 | +158 | 44 | 18 | 7 | 0 | 35 | |
| 3 | Nelson Bays | 8 | 5 | 0 | 3 | 289 | 192 | +97 | 39 | 29 | 3 | 0 | 23 | |
| 4 | North Otago | 8 | 4 | 0 | 4 | 285 | 228 | +67 | 36 | 32 | 4 | 2 | 22 | |
| 5 | Marlborough | 8 | 4 | 0 | 4 | 201 | 183 | +18 | 26 | 23 | 3 | 1 | 20 | |
| 6 | Manawatu | 8 | 3 | 0 | 5 | 155 | 200 | −45 | 20 | 27 | 2 | 1 | 15 | |
| 7 | Wanganui | 8 | 2 | 0 | 6 | 156 | 197 | −41 | 20 | 24 | 3 | 2 | 13 | |
| 8 | Poverty Bay | 8 | 3 | 0 | 5 | 161 | 298 | −137 | 20 | 30 | 1 | 0 | 13 | |
| 9 | East Coast | 8 | 0 | 0 | 8 | 71 | 423 | −362 | 8 | 62 | 0 | 0 | 0 |
Bye: Marlborough
Bye: East Coast
Bye: Wanganui
Bye: Poverty Bay
Bye: Nelson Bays
Bye: Manawatu
Bye: Counties Manukau
Bye: North Otago
Bye: Hawke's Bay
| Pos | Team | Pld | W | D | L | PF | PA | PD | TF | TA | TB | LB | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Wairarapa Bush | 7 | 6 | 0 | 1 | 257 | 94 | +163 | 37 | 10 | 6 | 1 | 31 | |
| 2 | Horowhenua-Kapiti | 7 | 6 | 0 | 1 | 189 | 123 | +66 | 29 | 15 | 4 | 0 | 28 | |
| 3 | King Country | 7 | 5 | 0 | 2 | 220 | 107 | +113 | 30 | 14 | 3 | 2 | 25 | |
| 4 | Buller | 7 | 5 | 0 | 2 | 153 | 149 | +4 | 17 | 19 | 2 | 0 | 22 | |
| 5 | Mid Canterbury | 7 | 2 | 0 | 5 | 108 | 149 | −41 | 9 | 18 | 1 | 2 | 11 | |
| 6 | Thames Valley | 7 | 2 | 0 | 5 | 131 | 185 | −54 | 13 | 24 | 1 | 1 | 10 | |
| 7 | South Canterbury | 7 | 2 | 0 | 5 | 98 | 191 | −93 | 13 | 25 | 1 | 1 | 10 | |
| 8 | West Coast | 7 | 0 | 0 | 7 | 79 | 237 | −158 | 11 | 34 | 0 | 2 | 2 |