HMAS St Giles (FY86) was a tugboat which was operated by the Royal Navy (RN), Royal Australian Navy (RAN) and the Australian shipping firms J.

She was built by Ferguson Shipbuilders, Glasgow for the RN in 1919, was sold to J.

Brown in 1925, transferred to the Waratah Tug and Salvage Co Pty Ltd in 1931 and was commissioned into the RAN between 1940 and 1942 and 1945 and 1946 before being scrapped in 1956.

The ship was built for the RN as the Rescue/Saint class ocean tug St Giles.

Following the outbreak of World War II, St Giles was requisitioned by the RAN in 1939.