Regimental Quartermaster Sergeant is a military rank in some militaries, and an appointment in others.
Battalion Quartermaster Sergeant (BQMS) (Ceathrúsháirsint Cathláin in Irish) is a rank in the Irish Army and Irish Air Corps equivalent to Warrant Officer Class 2 (NATO OR-8) in the British Army. The equivalent in the Artillery Corps is Regimental Quartermaster Sergeant (RQMS)
Like the UK example, the Regimental Quartermaster Sergeant is an appointment in a battalion-sized unit usually held by a Second Warrant Officer. He is the senior assistant to the Quartermaster, who may be a more senior Warrant Officer for non-combat units.
Regimental Quartermaster Sergeant (RQMS) is an appointment held by a senior Warrant Officer Class 2 in the British Army and Royal Marines. The RQMS is the senior assistant to the Quartermaster of a regiment or battalion and also usually functions as the deputy Regimental Sergeant Major. Some units have more than one RQMS. RQMS was a separate rank until 1915, when it became a Warrant Officer appointment with the creation of Warrant Officers Class II.
In the Household Cavalry, the appointment is instead Regimental Quartermaster Corporal (RQMC).