HMS Gannet (1878) was an Doterel-class screw sloop launched in 1878. She became a training ship in 1903 and was renamed HMS President, and was then lent as the training ship Mercury, she was moored in Gosport, Hampshire for many years. She was transferred as a museum ship in 1987 and is preserved in dry dockatChatham Dockyard.
HMS Gannet was a composite Nymphe-class screw sloop launched in 1888 as Nymphe. She became a base ship and was renamed Wildfire in 1906, renamed Gannet in 1916, and then Pembroke in 1917. She was sold in 1920.
HMS Gannet was a Medina-class iron screw gunboat launched in 1877 as Trent. She was renamed Pembroke in 1905, becoming a diving tender and being renamed Gannet in 1917. She was sold in 1923.
Gannet was a tug built for the State of Victoria in 1884 and armed as an auxiliary gunboat. She was sold in 1905.
LST 3006 was launched in 1945 and commissioned as HMS Tromsø in 1947. She was transferred to the Ministry of Transport as Empire Gannet in 1956 and was sold in 1968.