Ronald Brittain, MBE (2 September 1899 – 9 January 1981) was a well-known Regimental Sergeant Major (R.S.M.) in the British Army. The Warrant Officer class 1, who was reported on widely in the newspapers of the day, featured in several British military training films during the Second World War. He was said to have possibly the loudest voice in the British Army
On retiring from the army in the 1950s, R.S.M. Brittain's fame enabled him to enjoy a career in advertising, voice-over work and acting, playing characters that resembled an archetypal Sergeant Major.
Brittain was born in Gordon Terrace, Aigburth Vale, Liverpool, Lancashire, the son of a gardener. After leaving school, he worked in a local butcher's shop until 1917, when he enlisted in the King's (Liverpool) Regiment during the First World War.
He transferred into the South Wales Borderers, where his imposing height of six feet three inches soon saw him promoted. Eventually Brittain transferred to the Coldstream Guards.
He was attached to the training staff at the Royal Military College, Sandhurst where he became well known for his parade ground bellow. Known to the cadets as "The Voice", he was credited as the originator of that phrase so beloved of sergeant majors: "You 'orrible little man!". It was said he could reduce gentleman cadets — many of them foreign princes and titled sons of the — to trembling wrecks.
In his later years, he was assigned the position of Regimental Sergeant Major of the Guards Depot, one of the most senior non-commissioned appointments in the British Army. He also served at Mons Officer Cadet School in Aldershot, where it was estimated that around 40,000 officer cadets passed through his parade ground.