HMS Arethusa was a light cruiser of the Royal Navy, launched in 1913. She was part of the Arethusa-class and played a significant role during World War I, participating in various naval engagements. The ship was known for her speed and agility, making her effective in reconnaissance and escort duties. After the war, HMS Arethusa continued to serve in the Royal Navy until she was decommissioned in 1926. She was eventually sold for scrap in 1948. Throughout her service, she contributed to the development of naval tactics and the evolution of cruiser design in the early 20th century.