Four ships of the Royal Navy have borne the name HMS Empress:
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.
- HMS Empress was previously the 91-gun screw powered second rate HMS Revenge. She was renamed HMS Empress in 1891, on her conversion to a training ship. She was sold in 1923.
- HMS Empress (1906) was a tender, transferred from the War Department in 1906. She was renamed HMS Heron later that year and was sold in 1923.
- HMS Empress (1914) was a seaplane tender, originally launched as a merchant in 1907. She was requisitioned by the Navy between 1914 and 1919.
- HMS Empress (D42) was an escort carrier, originally USS Carnegie. She was transferred to the Royal Navy in 1943, and returned to the US Navy in 1946.
A training ship is a ship used to train students as sailors. The term is especially used for ships employed by navies to train future officers. Essentially there are two types: those used for training at sea and old hulks used to house classrooms.
The War Department was the United Kingdom government department responsible for the supply of equipment to the armed forces of the United Kingdom and the pursuance of military activity. In 1857 it became the War Office. Within the War Office, the name 'War Department' remained in use to describe the military transport services of the War Department Fleet and the War Department Railways.
HMS Empress was a seaplane carrier of the Royal Navy (RN) that served during the First World War. Converted from the Cross-Channel packet ship Empress, the ship's aircraft conducted aerial reconnaissance, observation and bombing missions in the North Sea and Eastern Mediterranean. During the last year of the war, she conducted anti-submarine patrols in the Mediterranean. Empress was returned to her owners in 1919 and was then sold to a French company in 1923. She was scrapped in 1933.
