Three ships of the Royal Navy have borne the name HMS Princess Louisa, after Princess Louisa:
The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by the English kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years War against the Kingdom of France. The modern Royal Navy traces its origins to the early 16th century; the oldest of the UK's armed services, it is known as the Senior Service.
Louise of Great Britain was Queen of Denmark and Norway from 1746 until her death, as the first wife of King Frederick V. She was the youngest surviving daughter of King George II of Great Britain and Caroline of Ansbach.
- HMS Princess Louisa was a 42-gun fifth rate launched as HMS Launceston in 1711. She was rebuilt in 1728 and renamed HMS Princess Louisa. She was wrecked in 1736.
- HMS Princess Louisa was a 60-gun fourth rate launched as HMS Swallow in 1732 and broken up in 1742.
- HMS Princess Louisa (1744) was a 60-gun fourth rate launched in 1744 and broken up by 1766.
HMS Swallow was a 60-gun fourth rate ship of the line of the Royal Navy, built to the dimensions of the 1719 Establishment at the Yard at Plymouth Dock, and launched on 6 October 1732. She was renamed HMS Princess Louisa in 1737.
HMS Princess Louisa was a 58-gun fourth rate ship of the line of the Royal Navy, built to the dimensions prescribed in the 1741 proposals of the 1719 Establishment at Limehouse, and launched on 1 July 1744.
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