[3] Commissioned in June 1915, Calliope was assigned to the Grand Fleet for service as flagship of the 4th Light Cruiser Squadron.

[5] She was badly damaged by a fuel oil fire in her boiler room while at sea on 19 March 1916, but was repaired in time to be one of the five ships in the 4th Light Cruiser Squadron at the Battle of Jutland on 31 May-1 June 1916.

Under the command of Commodore Charles E. Le Mesurier, HMS Calliope received a number of hits just before nightfall on 31 May (notably by the German battleships Kaiser and Markgraf), and 10 of her crew were killed.

[5] In March 1919, Calliope was commissioned for service with the 8th Light Cruiser Squadron on the North America and West Indies Station, based at the Royal Naval Dockyard in the Imperial fortress colony of Bermuda, with which she suffered another engine room fire in the Atlantic Ocean off the Azores in October 1919.

[7] She returned to Devonport for repairs, which were carried out between November 1919 and March 1920, and then recommissioned for continued service on the North America and West Indies Station.

In September 1928 received her last commission, this time with the 3rd Cruiser Squadron in the Mediterranean Fleet, which ended in January 1930 when she paid off into reserve at Portsmouth Dockyard.