Trentham (/ˈtrɛnθəm/) is the most populous suburb of Upper Hutt, a city in the Wellington region of New Zealand.

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.

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

[3] The name "Trentham" was initially given by Richard Barton, the first European Settler in the area, in honour of his former employer, the Duke of Sutherland.

Although some people chose not to answer the census's question about religious affiliation, 44.3% had no religion, 39.3% were Christian, 1.8% had Māori religious beliefs, 2.6% were Hindu, 0.7% were Muslim, 1.1% were Buddhist and 3.3% had other religions.

[20] Upper Hutt College is a co-educational state secondary school for Year 9 to 15 students,[21] with a roll of 1,113.