HMAS Leeuwin is a former Royal Australian Navy (RAN) shore establishment,[a] located in Fremantle, Western Australia.

[3]: 195 [4] The base was named after the Dutch galleon Leeuwin (lioness), which accidentally discovered the south-east coast of Western Australia in 1622 while sailing to Batavia.

[3]: 195 [6] Education and training of junior recruits was shared with the Royal Australian Naval College at HMAS Creswell, located on Jervis Bay, New South Wales.

[7]: 224  Leeuwin was decommissioned on 11 November 1986: one of several RAN facilities closed during the late 1980s and early 1990s because of funding cuts and the rationalisation and consolidation of shore bases.

[5]: 103  The Army began using the base in 1987 for the Western Australia University Regiment, initially as temporary accommodation along with Irwin Barracks, then permanently by 2009.

[4] The RAN maintains control of the wharves and boatsheds, and uses the base to host the Fremantle Port Division of the Royal Australian Navy Reserve.