The Cartier Island Marine Park (previously known as the Cartier Island Marine Reserve) is an Australian marine park that covers the Cartier Island and reef surrounds, about 610 km (380 mi) north of Broome, Western Australia. The marine park covers an area of 172 km2 (66 sq mi) and is assigned IUCN category Ia (Sanctuary Zone). It is one of the 13 parks managed under the North-west Marine Parks Network. While access has been restricted to the marine park for environmental protective measures, there is also a risk of unexploded ordnance as the area has previously been used for defence practise.