HMS Ariadne was a Diadem-class protected cruiser of the Royal Navy, which was launched in 1898, In March 1913, she was converted to a stokers' training ship and in 1917 was converted to a minelayer and assigned to the Nore Command.

She was torpedoed and sunk off Beachy Head by the German submarine UC-65 (Otto Steinbrinck) on 26 July 1917.

Ariadne was built by J&G Thompson of Clydebank and launched on 22 April 1898, when she was named by Lady Balfour of Burleigh, wife of Lord Balfour of Burleigh, who served as Secretary of State for Scotland.

[2] In March 1902 she was ordered to prepare for service on the North America and West Indies Station, where she would act as flagship to Vice-Admiral Sir Archibald L. Douglas when he took up command on the station in July that year.

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