HMS Tamar was a Royal Navy troopship built by the Samuda Brothers at Cubitt Town, London, and launched in Britain in 1863.

She served as a supply ship from 1897 to 1941, and gave her name to the shore station HMS Tamar in Hong Kong (1897 to 1997).

[1] Built in Cubitt Town in East London, she was launched in June 1863, and began her maiden voyage on 12 January 1864 as a troopship to the Cape and China.

In 1879, The British Medical Journal reported a group of sailors aboard Tamar were poisoned by a bad pigeon pie which spawned an Admiralty investigation.

Tamar had been towed out to a buoy on 8 December during the Battle of Hong Kong during World War II.

Amidst a curfew of darkness and bombardment by the Imperial Japanese forces, the orders came at 2100 hours on 11 December to scuttle her.