HMS Forth (1833) was a 44-gun fifth rate launched in 1833. She was converted to a screw frigate and undocked in 1856. She became a coal hulk in 1869 and was renamed HMS Jupiter, before being sold in 1883.
HMS Forth (1886) was a Mersey-classcruiser launched in 1886. She was to have been renamed HMS Howard in 1920, but this did not happen and she was sold in 1921.
HMS Forth (A187) was a submarine depot ship launched in 1938. She was renamed HMS Defiance between 1972 and 1978 and was sold for scrapping in 1985.