Fleet Base East is a Royal Australian Navy (RAN) major fleet base that comprises several naval establishments and facilities clustered around Sydney Harbour, centred on HMAS Kuttabul. Fleet Base East extends beyond the borders of Kuttabul and includes the commercially-operated dockyard at Garden Island, and adjacent wharf facilities at nearby Woolloomooloo, east of the Sydney central business district in New South Wales, Australia. Fleet Base East is one of two major facilities of the RAN, the other facility being Fleet Base West. The fleet operates in the Pacific Ocean.

The Royal Australian Navy (RAN) is the naval force of the Australian Defence Force (ADF). The professional head of the RAN is Chief of Navy (CN) Vice Admiral Mark Hammond AM, RAN. CN is also jointly responsible to the Minister of Defence (MINDEF) and the Chief of Defence Force (CDF). The Department of Defence as part of the Australian Public Service administers the ADF.