Goat Island / Rakiriri is an island in Otago Harbour in Otago, in the southern South Island of New Zealand. It is located between Port Chalmers and Portobello, to the northeast of Dunedin's city centre. The second-largest island in the harbour, Goat Island covers 4.5 hectares (11 acres), and is located to the northwest of the larger Quarantine Island/Kamau Taurua. Unlike its neighbour, Goat Island is uninhabited, and is designated as a scenic reserve and Historic Area.
The two islands, along with the Portobello Peninsula, are all part of a ridge (anticline) lying across the centre of the harbour, which was the crater of the long-extinct Dunedin volcano - running from Portobello to Port Chalmers. Goat Island / Rakiriri is one of New Zealand's dual placenames. The Maori language portion Rakiriri means "Angry sky".