HMAS Terka (FY.98) was an auxiliary minesweeper operated by the Royal Australian Navy (RAN) during World War II.

The ship was launched as Sir Dudley de Chair in 1925 as one of the three ships used to supply the construction of the Sydney Harbour Bridge, and from 1928 operated by the Adelaide Steamship Company until she was requisitioned by the RAN in December 1940.

The ship was launched in 1925 from the State Dockyard, Newcastle, New South Wales as Sir Dudley de Chair.

She was requisitioned by the RAN in December 1940 as part of Minesweeping Group 70 based at Darwin, Northern Territory.

She was converted into a water carrier and moved forward to New Guinea to support the efforts during World War II.