Green Island is a suburb of Dunedin, New Zealand. Not an actual island, this former borough takes its name from the Green Island bush, uncleared native forest extending from the valley where the community is centred over the hills towards the coast. The name of the nearby offshore island — Green Island (Okaihe) — was used to identify the bush and, thus, also lent its name to the mainland suburb.

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Green Island
Suburb
Main South Road, Green Island
Coordinates: 45°54′10″S 170°25′50″E
Country	New Zealand
City	Dunedin
Local authority	Dunedin City Council
Area [1]
• Land	364 ha (899 acres)
Population  (June 2023)[2]
• Total	2,450

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Fairfield	Abbotsford	Kaikorai Valley
	Green Island	Burnside
Waldronville

Under the 1989 local government reforms, the city of Dunedin and its surrounding region was grouped into a territorial authority called Dunedin City. Under this system, Green Island is officially an outer suburb within this territorial authority.

Green Island is on State Highway 1, about 9 km (6 mi) west-southwest of the Octagon, Dunedin's city centre. Along with neighbouring Abbotsford, it is the westernmost suburb within Dunedin City's main urban area. Green Island's main economy is based on light and small scale heavy industry.

Prior to 1950 Green Island, and neighbouring Burnside, had a strong Brass Band and Silver Band communities.

Green Island covers 3.64 km² (1.41 sq mi)^[1] and had an estimated population of 2,450 as of June 2023,^[2] with a population density of 673 people per km².

Green Island had a population of 2,319 at the 2018 New Zealand census, an increase of 84 people (3.8%) since the 2013 census, and an increase of 36 people (1.6%) since the 2006 census. There were 948 households, comprising 1,155 males and 1,164 females, giving a sex ratio of 0.99 males per female. The median age was 38.9 years (compared with 37.4 years nationally), with 435 people (18.8%) aged under 15 years, 426 (18.4%) aged 15 to 29, 1,098 (47.3%) aged 30 to 64, and 354 (15.3%) aged 65 or older.

Ethnicities were 91.3% European/Pākehā, 10.3% Māori, 2.5% Pasifika, 3.1% Asian, and 2.8% other ethnicities. People may identify with more than one ethnicity.

The percentage of people born overseas was 9.2, compared with 27.1% nationally.

Although some people chose not to answer the census's question about religious affiliation, 60.7% had no religion, 28.1% were Christian, 0.4% had Māori religious beliefs, 0.1% were Hindu, 1.0% were Muslim, 0.4% were Buddhist and 2.1% had other religions.

Of those at least 15 years old, 249 (13.2%) people had a bachelor's or higher degree, and 459 (24.4%) people had no formal qualifications. The median income was $32,300, compared with $31,800 nationally. 168 people (8.9%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 993 (52.7%) people were employed full-time, 255 (13.5%) were part-time, and 72 (3.8%) were unemployed.^[11]

Immediately to the north of Green Island, and only separated from it by the State Highway and South Island Main Trunk Railway is Abbotsford. Abbotsford is also a suburb within the Dunedin City territorial authority.