||The examples and perspective in this article deal primarily with the United Kingdom and do not represent a worldwide view of the subject. (March 2013)|
Colour sergeant or color sergeant (CSgt or C/Sgt) is a rank of non-commissioned officer found in several militaries.
British usage 
Colour sergeant or Staff Sergeant ('CSgt'/'SSgt' or formerly 'C/Sgt') is a non-commissioned title in the Royal Marines and infantry regiments of the British Army, ranking above sergeant and below warrant officer class 2. It has a NATO ranking code of OR-7 and is equivalent to the rank of flight sergeant or chief technician in the Royal Air Force, and chief petty officer in the Royal Navy. The insignia is the monarch's crown above three downward pointing chevrons.
The rank was introduced into the British Army during the Napoleonic Wars to reward long-serving sergeants. By World War I it had given way to company sergeant major and company quartermaster sergeant, but it was reintroduced later in the war.
Historically, colour sergeants of British line regiments protected ensigns, the most junior officers who were responsible for carrying their battalions' Colours (flag or insignia) to rally troops in battles. For this reason, to reach the rank of colour sergeant was considered a prestigious attainment, granted normally to those sergeants who had displayed courage on the field of battle. This tradition continues today as colour sergeants form part of a colour party in military parades.
Colour sergeants are referred to and addressed as "Colour Sergeant" or "Colour" ("Colour Sergeant Hewitt" or "Colour Hewitt", for instance), never as "Sergeant". Unusually, NCOs with the rank of colour sergeant who hold the appointment of company quartermaster sergeant are still addressed and referred to by their rank, not their appointment. In the Foot Guards Regiments a colour sergeant is addressed as described above by superiors, and as "Sir" by lower ranks.
During ceremonial events it is from the colour sergeant that the ensign collects the colour of the battalion or regiment.
Canadian usage 
Colour Sergeant is also a rank in the foot guards regiments of the Canadian Forces, specifically the Governor General's Foot Guards and the Canadian Grenadier Guards. It is the equivalent to Warrant Officer; a Colour Sergeant wears the rank insignia of a Warrant Officer (a royal crown) on all uniforms except No. 1 Ceremonial Dress, on which a special rank badge is worn: three chevrons, point down, surmounted by an image of regimental colours.
Canadian Colour Sergeants are addressed in the same manner as their British counterparts.
United States 
The rank of Colour Sergeant or Color Sergeant is an NCO rank that was used at different times in the U.S. military. The rank was last used in the U.S. Army during World War I.
See also