Groote Eylandt is the largest island in the Gulf of Carpentaria in northeastern Australia. The island, approximately 2,260 km² in size, was named by Abel Tasman in 1644 and is Dutch for "Big Island", using a now archaic spelling.

The island belongs to the Anindilyakwa aboriginal people. Gemco, a BHP subsidiary, operates a large manganese mine near the community of Angurugu, paying royalties to the traditional owners. It has a yearly production of more than 2 million tonnes, which is about 10 percent of the world's total.