HMAS Encounter was a second-class protected cruiser of the Challenger class operated by the Royal Navy (RN) and Royal Australian Navy (RAN). She was built by HM Dockyard Devonport and completed at the end of 1905.

The Challenger-class cruisers were a pair of second-class protected cruisers built for the Royal Navy in the first decade of the 20th century. One ship, HMS Encounter, was later transferred to the Royal Australian Navy.