The Royal Naval Volunteer Reserve Long Service and Good Conduct Medal, initially designated the Royal Naval Volunteer Reserve Long Service Medal, was instituted in 1908. It could be awarded to part-time ratings in the United Kingdom's Royal Naval Volunteer Reserve after twelve years of service and good conduct. The medal was a Naval version of the Volunteer Long Service Medal and its successor, the Territorial Force Efficiency Medal. The medal could also be awarded to part-time ratings in the Naval Volunteer Reserves of Dominion and Colonial Auxiliary Forces throughout the British Empire.