The Duke of York holds two naval service appointments:

- Commodore-in-Chief, Fleet Air Arm (since August 2006)
- Admiral of the Sea Cadet Corps, which he took over from The Duke of Edinburgh in 1992

His Royal Highness also holds appointments in the British Army:

- Colonel-in-Chief of The 9th/12th Royal Lancers (a role formerly undertaken by Queen Elizabeth The Queen Mother) (since July 2003)
- Colonel-in-Chief of The Yorkshire Regiment (14th/15th, 19th and 33rd/76th Foot) (since June 2006)
- Colonel-in-Chief of The Royal Irish Regiment (27th (Inniskilling), 83rd, 87th and The Ulster Defence Regiment) (since June 1992)
- Colonel-in-Chief of the Small Arms School Corps (since July 2003)
- Royal Colonel of The Royal Highland Fusiliers, 2nd Battalion The Royal Regiment of Scotland (since March 2006)

And in the Royal Air Force:

- Honorary Air Commodore of RAF Lossiemouth, Morayshire (1996), the RAF station next to Gordonstoun School

The Duke is also Colonel-in-Chief of the following Commonwealth forces:

- The Queen’s York Rangers (First Americans)
- Royal Highland Fusiliers of Canada
- Princess Louise Fusiliers (Canada)
- Royal New Zealand Army Logistics Regiment.