SS Westralia was a 2,884 GRT cargo and passenger ship. She served as a troopship in the First World War and was later converted into a hulk. She was sunk in the air raids on Rabaul on 20 January 1942. Sir J Laing & Sons, Sunderland, built her in 1897 for the Melbourne-based Huddart Parker line. She worked along the Australian coast and the trans-Tasman route. In 1917, she was used a troopship, transporting the New Zealand 27th and 28th Main Regiment. She then resumed commercial service with Huddart Parker.