Vice Admiral Stuart Campbell Mayer, is a senior officer in the Royal Australian Navy. He commanded the International Stabilisation Force in Timor-Leste from 2009 to 2010, was Commander Australian Fleet from 2014 to 2018, and served as Head Force Design within the Vice Chief of Defence Force Group from 2018 to 2019. He assumed his current appointment as Deputy Commander United Nations Command, based in South Korea, in July 2019.