Whangārei is the northernmost city in New Zealand and the largest settlement of the Northland Region. It is part of the Whangarei District, created in 1989 from the former Whangarei City, Whangarei County and Hikurangi Town councils to administer both the city and its hinterland. The city population was estimated to be 56,100 in June 2025, an increase from 47,000 in 2001.

The origin of the name Whangārei is unclear, as a number of traditional Māori stories are associated with the harbour. One major tradition involves the sisters Reitū and Reipae of the Tainui migratory waka, who either flew from the Waikato north on the backs of birds, or in the form of birds.

Other traditions describe the meaning of Whangārei as "lying in wait to ambush", referring to warriors watching over the harbour from Castle Rock, or Whangārei meaning "to gather", referring to the harbour as a gathering place for whales or for important rangatira.

The harbour is known from traditional histories as a landing point for many of the migratory waka which reached New Zealand, including Tūnui-ā-rangi and Te Arawa. Many stories involving the Whangārei Harbour involve the legendary chief Manaia. Whangārei was traditionally an important location for trade during much of pre-European Māori history, linking the Muriwhenua iwi of the far north, the residents of the Hauraki Gulf islands, and Tāmaki Māori iwi to the south. An overland route, the Mangapai portage, allowed waka to be hauled between the Whangārei Harbour in the east, and the Wairoa River and Kaipara Harbour to the west along the Mangapai River.

A number of Māori iwi are associated with the early history of Whangārei, including Ngare Raumati, Ngāi Tāhuhu, Ngātiwai and Te Parawhau. In the late 18th century, Ngāpuhi expanded south into the Whangārei area.

Captain James Cook and the crew of the Endeavour were the first Europeans to sight the Whangārei Harbour entrance. On 15 November 1769 they caught about a hundred fish in the harbour, which they classified as "bream" (probably snapper), prompting Cook to name the area Bream Bay. In the early 19th century, when Europeans began visiting the harbour more regularly, Ngāpuhi occupied Whangārei, and the Te Parawhau hapū lived at the head of the harbour.

In the 1820s, the area was repeatedly attacked by Waikato and Ngāti Pāoa raiders during the Musket Wars. The first European settler was William Carruth, a Scotsman and trader, who arrived in 1839 and was joined six years later by Gilbert Mair and his family. Relations between the settlers and local Māori were generally friendly, but in February 1842, all settler farms were plundered in revenge for transgressions of tapu. In April 1845, during the Flagstaff War, all settlers fled from Whangārei. Most of the original settlers never returned, but by the mid-1850s there were a number of farmers and orchardists in the area. From 1855, a small town developed, driven by the kauri gum trade. Today's 'Town Basin' on the Hātea River was the original port. Early exports included kauri gum and native timber, followed later by coal from Whau Valley, Kamo, and Hikurangi. Coal from the Kiripaka field was exported via the Ngunguru River. By 1864, the nucleus of the present city was established.

Fire bricks made from fire clay deposits near the Kamo mines supported a brickworks over several decades. Good quality limestone was quarried at Hikurangi, Portland and Limestone Island, and initially sold as agricultural lime, and later combined with local coal to produce Portland cement at the settlement of Portland on the south side of the harbour. Local limestone is still used in cement manufacture, but the coal is now imported from the West Coast of the South Island.^{[citation needed]}