HMAS Una was a Royal Australian Navy sloop that began its life as the German motor launch Komet.

The ship and her 57 crew was captured by an infantry detachment of the Australian Naval and Military Expeditionary Force led by John Paton on 9 October 1914, with no loss of life.

During the time in which Una was in service under Australia, the sloop was used as a patrol and general purpose vessel.

The sloop was used to patrol the areas of New Guinea, New Britain, New Hebrides and Malayan waters.

[5] After World War I, Una was decommissioned and taken to Port Phillip Bay, renamed Akuna and used as a pilot vessel.