TB 191 was a second-class torpedo boat constructed for the Colony of Tasmania and later operated by the Commonwealth Naval Forces and the Royal Australian Navy.

[1] TB 191 was ordered by the Australian colonial government of Tasmania in 1882 to protect the colony from possible Russian or French attack, and was built by John I. Thornycroft & Company.

[2] The torpedo boat was 67 feet (20 m) long, with a draught of 3.25 feet (0.99 m), and a displacement of 12.5 tons, similar to the other torpedo boats ordered by the other Australian colonies.

Built at a cost of £4,011,[3] TB 191 arrived in Tasmania on board SS Abington on 1 May 1884.

She was sold in 1905 to the Colony of South Australia, being towed to Adelaide by HMCS Protector,[3] before becoming part of the Commonwealth Naval Forces.