HMAS Assault is a former Royal Australian Navy (RAN) training centre that was in use during World War II, located at Nelson Bay in the Mid North Coast region of New South Wales, Australia.

In June 1942, Royal Navy Commander F. N. Cook, the former commander of the Combined Operations Centre – HMS Tormenter – who was on loan to the RAN to help establish an Australian combined operations school, identified Port Stephens as the ideal location to establish a RAN training base for amphibious landings.

[1]: 118–9  On 9 August, General Douglas MacArthur ordered the establishment of the Joint Overseas Operational Training School (JOOTS) at Port Stephens.

[1]: 121  For administrative purposes, landing and shore personnel trained at Assault were considered to be attached to the base, not the ships that they were embarked in.

[1]: 123  The RAN continued training its own boat and beach crews at Assault until August 1944,[1]: 123  when the base was decommissioned[citation needed] and reduced to a caretaker establishment.