Two ships of the Royal Australian Navy have been named for the Diamantina River in Queensland.

The first HMAS Diamantina (K-377/F-377/A-266/GOR-266) was a River class frigate laid down by Walkers Limited at Maryborough in Queensland on 12 April 1943, launched on 6 April 1944 by Mrs. W. J. F. Riordan, wife of the then Chairman of Committees in the House of Representatives and later Minister for the Navy and commissioned at Hervey Bay in Queensland on 27 April 1945 under the command of Commander G. M. Rose. Diamantina paid off to reserve on 9 August 1946 but recommissioned as an oceanographic survey ship on 22 June 1959. HMAS Diamantina paid off on 29 February 1980, the last of the wartime frigates still in service with the Royal Australian Navy. She was handed over to the Queensland Maritime Museum Association to be permanently berthed as an exhibit in the old graving dock at Brisbane.

The second HMAS Diamantina is a Huon class minehunter laid down by Australian Defence Industries at Newcastle, New South Wales on 4 August 1998, launched on 18 November 2000 by Mrs. Maureen Bryden, daughter of the late Commander G. M. Rose and commissioned in February 2001.