The house flag of the Australian Coastal Shipping Commission, Melbourne. A flag with a white field bearing a blue cross. The letters 'ACSC' in red appear in the four quarters. The flag is made of a wool and synthetic fibre bunting. It has a cotton hoist and is machine sewn. A rope is attached. This design was in use from 1956 to 1968 when the initials 'ACSC' were replaced by 'ANL' in the first quarter.

The Commission was established by Act of Parliament on 1 October 1956 to take over and manage vessels previously under the control of the Australian Shipping Board. This body had been made responsible for the management of merchant vessels in government ownership as a result of wartime conditions. The registered name of the fleet was the Australian National Line. It extended its operations to Japan and Europe in 1969 and to other countries in the 1970s. In 1974 it became the Australian Shipping Commission and was replaced by the wholly government owned Australian National Line in 1989.