Arethusa class
Two classes of ships of the British Royal Navy are referred to as the Arethusa class :
- Arethusa class (1913) , a class of eight light cruisers built between 1912 and 1914 and used in World War I.
- Arethusa class (1934) , a class of four light cruisers built between 1934 and 1936 and used during World War II