Lieutenant General John James Frewen, AO, DSC is a retired senior officer of the Australian Army.

He was appointed Principal Deputy Director-General of the Australian Signals Directorate in March 2018, and Coordinator General of the National COVID Vaccine Taskforce in June 2021.

As a lieutenant colonel, Frewen commanded the 2nd Battalion, Royal Australian Regiment (2RAR) from January 2003 to December 2004.

"[5][6] Frewen was appointed Principal Deputy Director-General of the Australian Signals Directorate (ASD) on 1 March 2018.

[9][10] Frewen succeeded Vice Admiral Jonathan Mead as Chief of Joint Capabilities in September 2021, but remained seconded to the National COVID Vaccine Taskforce until July 2022.