This is a list of twin towns and sister cities (see town twinning) in the South Island.
| Country | City |
|---|---|
| China | Puyang, Henan |
| Japan | Minamiuonuma, Niigata |
| United Kingdom | Ashburton, Devon |
| United States | Pulaski, Virginia |
| Country | City |
|---|---|
| Japan | Hita, Ōita |
| United States | Westport |
| Country | City |
|---|---|
| United States | Jacksonville, Oregon |
| Japan | Nantan, Kyoto |
| Country | City |
|---|---|
| China | Shanghai |
| Japan | Otaru, Hokkaido |
| South Korea | Dongdaemun-gu |
| United Kingdom | Edinburgh, Scotland |
| United States | Portsmouth, Virginia |
| Country | City |
|---|---|
| Australia | Tamworth, New South Wales |
| Country | City |
|---|---|
| Australia | Hobart, Tasmania |
| Japan | Kumagaya, Saitama |
| Country | City |
|---|---|
| Australia | St Helens, Tasmania |
| United States | Lahaina, Hawaii |
| Country | City |
|---|---|
| Japan | Otari, Nagano |
| Japan | Tendō, Yamagata |
| Country | City |
|---|---|
| China | Huangshi |
| Japan | Miyazu, Kyoto |
| United States | Eureka, California |
| Country | City |
|---|---|
| Japan | Masuda, Shimane |
| United States | Aspen, Colorado |
| Country | City |
|---|---|
| Japan | Akitakata, Hiroshima |
| Japan | Yūbetsu, Hokkaidō |
| Country | City |
|---|---|
| Australia | Wyong, New South Wales |
| Italy | Cinque Terre |
| Country | City |
|---|---|
| Japan | Fujimi, Nagano |
| Netherlands | Grootegast |
| Japan | Kiyosato, Hokkaidō |
| Country | City |
|---|---|
| Australia | Orange, New South Wales |
| China | Wehai |
| Japan | Eniwa, Hokkaidō |
| United States | Orange, California |
| Country | City |
|---|---|
| France | Bourail, New Caledonia |
| United States | Milton-Freewater, Oregon |
| Country | City |
|---|---|
| United Kingdom | Devizes, Wiltshire |
| Country | City |
|---|---|
| Australia | Deloraine, Tasmania |
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