Vice Admiral Stuart Campbell Mayer, AO, CSC & Bar (born c. 1965) is a retired senior officer of the Royal Australian Navy.

He joined the navy via the Royal Australian Naval College at HMAS Creswell in 1984 and qualified as a Principal Warfare Officer in 1994.

Mayer completed training as an Air Intercept Controller and returned to sea in HMA ships Canberra and HMAS Sydney, including service aboard Sydney "as Air Intercept Control Officer and Boarding Officer during that ship's operational deployment to the Persian Gulf during the 1990–91 Gulf war.

[2] Mayer left HMAS Canberra in July 2004 and was promoted to the rank of captain and assumed the position of Chief Staff Officer (Operations) at Maritime Headquarters (MHQ) Australia in January 2005.

[4] In January 2007 Mayer attended the Australian Defence College and read for a Master of Arts in Strategic Studies.

Mayer left Anzac in mid-2009, was promoted to commodore and appointed Commander of the multi-national International Stabilisation Force (ISF) in East Timor on 24 October 2009.

The first non-army officer to hold this command, Mayer demonstrated "inspirational leadership and initiative, and outstanding dedication to duty in [a] stable but fragile security environment" during his six-month deployment, for which he was awarded a Bar to his CSC and the East Timorese Medal of Merit.