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. Komet was then sailed to Sydney as a prize. In December 1918, Una was sent to Darwin to protect Administrator John Gilruth, following the Darwin Rebellion. She arrived on Christmas Eve anchoring beneath the Government House cliffs until HMAS Encounter arrived in early 1919.