The Distinguished Service Order (DSO) is a military decoration of the United Kingdom, as well as formerly of other parts of the Commonwealth, awarded for operational gallantry for highly successful command and leadership during active operations, typically in actual combat. Since 1993 it has been awarded specifically for "highly successful command and leadership during active operations", with all ranks being eligible. It is a level 2A decoration (order) in the British system of military decorations.

A medal ribbon, service ribbon or ribbon bar is a small ribbon, mounted on a small metal bar equipped with an attaching device, which is generally issued for wear in place of a medal when it is not appropriate to wear the actual medal. Each country's government has its own rules on what ribbons can be worn in what circumstances and in which order. This is usually defined in an official document and is called "the order of precedence" or "the order of wearing." In some countries, some awards are "ribbon only," having no associated medal.