HMAS Lachlan (K364/F364) (later HMNZS Lachlan (F364)) was a River-class frigate that served the Royal Australian Navy (RAN) from 1945 to 1949.
Lachlan was laid down by Morts Dock and Engineering Company at Balmain, New South Wales on 22 March 1943 and launched on 25 March 1944 by Sarah McNamara Scullin, wife of former Australian Prime Minister James Scullin. The ship was named for the Lachlan River in New South Wales, and commissioned into the RAN on 14 February 1945.
During 1945, Lachlan was used during the opening of the Captain Cook Graving Dock; her bow was used to cut the ribbon across the drydock's mouth.
Lachlan paid off on 5 October 1949. She was transferred to the Royal New Zealand Navy, renamed HMNZS Lachlan, and served as a survey and Antarctic supply vessel until February 1975. She was used as a "Refit Barge" with many workshops onboard until the late 1980s when she was sold to Chile to continue work as floating workshops for ships being refitted