Four ships of the Royal Navy have been named HMS Louisa:
HMS Louisa was a 3-gun gunvessel, previously a hoy, purchased in 1794 and sold in 1798.
HMS Louisa was also a 3-gun vessel, separate from the above, purchased in 1798 and sold in 1799.
HMS Louisa was a tender in service in 1814 and sold in 1816.
HMS Louisa was a cutter purchased in 1835. She foundered in 1841.
HMS Louisa was an Albacore-class wooden screw gunboat launched in 1855 and sold in 1867.
