Great Keppel Island lies 15 kilometres from the coast off Yeppoon along the Capricorn Coast of Central Queensland, Australia. The island is the largest of the eighteen islands in the Keppel Group, and covers an area of more than 14.5 km². It is within the local government area of Shire of Livingstone .
The tropical climate and numerous beaches attract tourists from all points, and a number of accommodation houses cater for them including Keppel Lodge and various houses. There are 17 white sandy beaches with some of the highest cover of hard coral reefs on the Great Barrier Reef. The coral diversity of these reefs matches that of the Whitsundays with clear waters most of the year around. The island is served by ferries and aircraft.
The islands were named by Captain James Cook in 1770 after the then First Lord of the Admiralty, Admiral Augustus Keppel.
Prior to European settlement, the island was home to the Woppaburra and Ganumi people of the Darumbal nation, with centuries old middens testifying to the quantity of seafood found in the surrounding waters. European settlers killed or removed most of the indigenous population by the end of the 19th century. During its early European history, the island was used to raise sheep, however it is now a tourist destination.