Whangarei District is a territorial authority district in the Northland Region of New Zealand that is governed by the Whangarei District Council. The district is made up in area largely by rural land, and includes a fifth of the Northland Region. It extends southwards to the southern end of Bream Bay, northwards to Whangaruru and almost to the Bay of Islands, and westwards up the Mangakahia River valley past Pakotai and almost to Waipoua Forest. It includes the Hen and Chicken Islands and the Poor Knights Islands.
The principal urban area and district seat is the city of Whangārei. Other towns include Hūkerenui, Hikurangi, Titoki, Portland, Ruakākā and Waipu. The district population was 98,300 in June 2020.
The district contains beaches such as Ngunguru, game fishing at Tutukaka, a variety of beaches along Whangārei Harbour, as well as Matakohe or Limestone Island in the Harbour, now subject to ecological restoration. The main airport for the district is Whangarei Airport.