[1] The flag combines three of the county's symbols: the red and white dancetté background, taken from the arms of Simon de Montfort, 6th Earl of Leicester; the Cinquefoil of the de Beaumont Earls of Leicester; and the running fox from the county's crest, used on many of the county organisations’ emblems.

It was designed by Jason Saber and adopted at the request of all seven of Leicestershire's Members of Parliament.

It was the final English county flag to be adopted, and was first flown officially for Historic County Flag Day 2021 in Parliament Square, London.

The Pantone Colours for the flag are:[1] Prior to the registration of the flag, a banner of the coat of arms of Leicestershire County Council was often marketed as a county flag for Leicestershire, however legally speaking, this banner represents only the council, and flying it requires its permission.

[2] A public competition was held to select a design for a flag for Leicestershire from six finalists in November 2020.