The New Zealand and South Seas International Exhibition was a world's fair held in Dunedin, New Zealand from 17 November 1925 until 1 May 1926, which celebrated that country and the South Seas. It was the third such exhibition held in Dunedin, with earlier exhibitions in 1865 and 1889. The exhibition had over 3 million visitors.
It was held on reclaimed land at Logan Park, much of it reclaimed especially for the exhibition. A tidal inlet originally known as Pelichet Bay had been partly reclaimed, leaving a flat area and a lake, Lake Logan. In order to provide enough land for the exhibition, the lake was drained and the site cleared before construction of a series of magnificent exhibition buildings by architect Edmund Anscombe. The buildings consisted of a series of pavilions surrounding a central court area which was dominated by a domed festival hall, and covered an area of 16 acres (6.5 ha). A new tree-lined road, linking the exhibition grounds with the city centre, was completed, which now forms Anzac Avenue.
The exhibition grounds and buildings included an amusement park with a quarter-mile scenic railway loop, restaurant, and tearooms, along with displays from both New Zealand provinces and overseas countries, with "courts" set up by the United Kingdom, Canada, Australia, and Fiji. The exhibition was opened by the Governor-General, Sir Charles Fergusson, in November 1925, and remained open until the middle of the following year. Although the country's population at the time was only 1,250,000, a total of more than 3,000,000 visitors paid for admission to the exhibition. Even in its closing stages, the exhibition was most popular; the final day's attendance was a record 83,935.
The exhibition was commemorated in a set of three stamps issued by the New Zealand Post Office, designed by H Linley Richardson. The set was one of New Zealand's first commemorative stamp issued, and also one of very few from the country to be printed on coloured paper.
Little now remains of the exhibition venue and structure other than Logan Park and Anzac Avenue themselves. The only remaining structure on the original site, the exhibition's art gallery, was bought at the conclusion of the exhibition by Sir Percy Sargood and his family, and donated to the city as an art gallery. The building remained the site of the Dunedin Public Art Gallery until a new site was completed for the gallery in the central city in 1996.