Four Canadian naval units have been named HMCS Ottawa.
HMCS Ottawa (H60) (I) was a C-class destroyer commissioned as HMS Crusader (H60) in the Royal Navy before serving with the Royal Canadian Navy from 1938-1942.
HMCS Ottawa (H31) (II) was a G-class destroyer commissioned as HMS Griffin (H31) in the RN before serving with the RCN from 1943-1945.
HMCS Ottawa (DDH 229) (III) was St. Laurent-class destroyer that served in the RCN and Canadian Forces from 1956-1992.
HMCS Ottawa (FFH 341) (IV) is a Halifax-class frigate commissioned in 1996.
