The Australian National Maritime Museum (ANMM) is a federally operated maritime museum in Darling Harbour, Sydney. After considering the idea of establishing a maritime museum, the federal government announced that a national maritime museum would be constructed at Darling Harbour, tied into the New South Wales state government's redevelopment of the area for the Australian bicentenary in 1988. The museum building was designed by Philip Cox, and although an opening date of 1988 was initially set, construction delays, cost overruns, and disagreements between the state and federal governments over funding responsibility pushed the opening to 1991.

One of six museums directly operated by the federal government, the ANMM is the only one located outside of the Australian Capital Territory. The museum is structured around seven main galleries, focusing on the relationships between Indigenous Australians and the sea, the navigation of Australian waters, travel to Australia by sea and the naval defence of the nation. Four additional gallery spaces are used for temporary exhibits. Four museum ships – the HM Bark Endeavour Replica, the destroyer HMAS Vampire, the submarine HMAS Onslow and a replica of the Duyfken – are open to the public, while smaller historical vessels berthed outside can be viewed but not boarded.

Of the six museums operated directly by the federal government (the Australian National Maritime Museum, the Australian War Memorial, the National Museum of Australia, the National Gallery of Australia, the National Portrait Gallery, and Questacon), the Australian National Maritime Museum is the only one located outside the Australian Capital Territory. The museum is administered by the Department of Communications and the Arts on behalf of the Australian Government.

In June 1985, the federal government announced the establishment of a national museum focusing on Australia's maritime history and the nation's ongoing involvement and dependence on the sea. Proposals for the creation of such a museum had been under consideration over the preceding years. After lobbying by New South Wales Premier Neville Wran, the decision was made to situate the new museum at Darling Harbour, and construct it as part of the area's redevelopment. The building of the ANMM was seen by both the federal and New South Wales State governments as an important feature of the redevelopment, as it would be a major drawcard, and help fuel the commercial success of the precinct.

The museum building was designed by Philip Cox, Richardson Taylor & Partners. The roof was shaped to invoke the image of billowing sails: the corrugated metal roof stands over 25 metres (82 ft) tall on the west side, but drops significantly on the east.

During development, the museum ran into a series of difficulties. In March 1998, the three top members of the ANMM interim council were sacked by the federal government and replaced. Later in the year, the Department for the Arts informed the museum that its staff would be reduced by 30% and it would undergo budget cuts, forcing the Australian National Maritime Museum to rely on contracted security and conservation staff, along with volunteer guides and attendants. The acceptance of a US$5 million grant for a dedicated gallery showing the links between the US and Australia resulted in the displacement of much of the staff and research areas. Most of these were later established in the nearby Wharf 7 building.^{[citation needed]}

The museum was initially slated to open in 1988, but by October that year, construction delays had pushed the planned opening date to September 1989, and the project was already $12.5 million over the $30 million budget. Construction was completed on 17 November 1989; the cost of the museum's construction had increased to $70 million, and although the federal government was willing to pay the initial $30 million, there were disagreements between the state and federal governments over who had to supply the additional $40 million. It was resolved that New South Wales was responsible for the additional funding, and in October 1990, the museum building was handed over to the federal government. The Australian National Maritime Museum was opened on 30 November 1991.

In order to achieve commercial sustainability, the Australian National Maritime Museum was directed by the federal government to institute entry fees: the second Australian national museum to do so after Questacon was opened in 1988. The entry fee for the museum itself was dropped in 2004 (although access to the museum ships was still charged), then was re-added in December 2011.