Porirua is a city in the Wellington Region of New Zealand, immediately north of the city of Wellington, with their central business districts 20 km apart.
A large proportion of the population commutes to Wellington, so it may be considered a satellite city. It almost completely surrounds Porirua Harbour at the southern end of the Kāpiti Coast. The eastern inlet of the harbour is known as Pāuatahanui, and is notable for its world-class estuarine values.
Porirua had an estimated population of 62,400 as of June 2023.