Trentham, New Zealand

Trentham
View looking northeast from Silverstream, with Trentham Racecourse in the centre and Trentham Army Camp at right
Interactive map of Trentham
Coordinates: 41°08′07″S 175°02′25″E / 41.13528°S 175.04028°E / -41.13528; 175.04028
CountryNew Zealand
RegionWellington Region
Territorial authorityUpper Hutt
Electorates
Government
 • Territorial AuthorityUpper Hutt City Council
 • Regional councilGreater Wellington Regional Council
 • Mayor of Upper HuttPeri Zee
 • Remutaka MPChris Hipkins
 • Ikaroa-Rāwhiti MPCushla Tangaere-Manuel
Area
 • Total
11.37 km2 (4.39 sq mi)
Population
 (June 2025)
 • Total
11,730
 • Density1,032/km2 (2,672/sq mi)

Trentham (/ˈtrɛnθəm/) is the most populous suburb of Upper Hutt, a city in the Wellington region of New Zealand. The suburb is located in a widening of the Hutt Valley, five kilometres to the southwest of the Upper Hutt city centre.

The suburb includes the Trentham Racecourse, the base of the Wellington Racing Club, the site of Hutt International Boys' School, and the Trentham Railway Station.

The Trentham Military Camp was used extensively for training soldiers in preparation for World War I and World War II. It is still a base for the New Zealand Defence Force.

A General Motors-Holden assembly plant operated in Trentham between 1967 and 1990.