Four ships of the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 have been named HMS Louisa:
was a 3-gun gunvessel, previously a hoy

Hoy (boat)

A hoy was a small sloop-rigged coasting ship or a heavy barge used for freight, usually displacing about 60 tons. The word derives from the Middle Dutch hoey. In 1495, one of the Paston Letters included the phrase, An hoye of Dorderycht , in such a way as to indicate that such contact was then...

, purchased in 1794 and sold in 1798. was a tender in service in 1814 and sold in 1816. was a cutter purchased in 1835. She foundered in 1841. was an Albacore-class wooden screw gunboat

Gunboat

A gunboat is a naval watercraft designed for the express purpose of carrying one or more guns to bombard coastal targets, as opposed to those military craft designed for naval warfare, or for ferrying troops or supplies.-History:...

launched in 1855 and sold in 1867.