New Plymouth Boys' High School is a single-sex boys' state secondary school in New Plymouth, Taranaki, New Zealand.

New Plymouth is the major city of the Taranaki region on the west coast of the North Island of New Zealand. It is named after the English city of Plymouth, in Devon, from where the first English settlers to New Plymouth migrated. The New Plymouth District, which includes New Plymouth City and several smaller towns, is the 10th largest district in New Zealand, and has a population of 88,900 – about two-thirds of the total population of the Taranaki Region and 1.7% of New Zealand's population. This includes New Plymouth City (59,600), Waitara (7,550), Inglewood (3,870), Ōakura (1,730), Ōkato (561) and Urenui (429).