Roy Halliday
| Sir Roy Halliday | |
|---|---|
| Nickname(s) | "Gus" | 
| Born | 27 June 1923 | 
| Died | 23 November 2007 (aged 84) Bank, near Lyndhurst, Hampshire | 
| Allegiance | United Kingdom | 
| Branch | Royal Navy | 
| Years of service | 1941–1981 | 
| Rank | Vice Admiral | 
| Commands | 3rd Destroyer Squadron Commander (Air), HMS Albion HMS Diligence 813 Naval Air Squadron | 
| Battles / wars | Second World War | 
| Awards | Knight Commander of the Order of the British Empire Distinguished Service Cross Mentioned in Despatches | 
| Other work | Chairman of Trustees of the Burma Star Association Chairman of the British Military Power Boat Trust | 
Vice Admiral Sir Roy William "Gus" Halliday, KBE, DSC (27 June 1923 – 23 November 2007) was a British naval pilot who saw service in the Second World War, in the British Pacific Fleet and subsequently became Director-General Intelligence in Britain's Defence Intelligence Staff from 1981 to 1984.