| Summerlea | |
| Population As Of: | 2006 |
| Subdivision Type: | Country |
| Subdivision Name: | New Zealand |
| Subdivision Type1: | Region |
| Subdivision Name1: | West Coast |
| Subdivision Type2: | District |
| Subdivision Name2: | Buller District |
| Seat Type: | Electorates |
| Seat: | West Coast-Tasman Te Tai Tonga |
| Pushpin Map: | New Zealand West Coast |
| Coordinates: | -41.5303°N 171.9422°W |
Summerlea is a lightly populated locality on the West Coast of New Zealand's South Island.
Summerlea is on the Tasman Sea coastline with the Glasgow Range to the east. To the north of the town is the neighbouring settlement of Mokihinui and the rivermouth of the Mōkihinui River. State Highway 67 passes through the locality. It is included in the Mokihinui statistical area by Statistics New Zealand, and according to the 2013 New Zealand census, Mokihinui has a population of 186, an increase of 15 people since the 2006 census.
In the early 1890s, a branch line railway was opened from Westport through Summerlea, opening to Seddonville on 23 February 1895 and thus acquiring the name of the Seddonville Branch. Passenger services were provided to Summerlea by mixed trains until 14 October 1946, when the line became freight-only. Coal was almost the sole traffic on the line from this point, and when coal mining activity declined in the 1970s, the line's maintenance costs came to outweigh revenue. Accordingly, the line closed beyond Ngakawau on 3 May 1981, and much of the line's formation can still be seen passing through the countryside around Summerlea.[1]