HMS Endymion was a first-class protected cruiser of the Edgar class. She served in China during the Boxer Rebellion and later in the First World War, and was sold in 1920.

The Edgar class were nine first-class protected cruisers built for the Royal Navy under the Naval Defence Act of 1889. The class gave long service and all of the ships participated in the First World War. One, HMS Hawke, was lost during the war, with the other eight being scrapped in the 1920s.