File:Monmouthshire arms.png

Arms of ) County Council, also used by Gwent County Council 1974 to 1996.

Originally granted to Monmouthshire County Council 28th January 1948. The council was abolished in 1974.

Transferred by Order in Council dated 16th April 1975 to Gwent County Council. Gwent was abolished in 1996.

Transferred to the unitary Monmouthshire County Council by order in Council dated 18th October 1996.

The gold fleur-de-lis upon blue and black are the attributed arms of the ancient Kingdom of Gwent. The castles are the arms of the ancient princes of Gwent and also refer to the many castles situated in the County.

The Coat of Arms shown on the castle forming the crest refers to the connections of the Somerset family with the County. The castle itself refers to Raglan Castle associated with Henry Somerset. The three towers that rise from it are for the three castles of Grosmont, Llantilo and Skenfrith.

The motto Utrique Fidelis (Faithful to Both) shows the county as faithful to both England and Wales, and the lion of England and the dragon of Wales, each holding its country's national emblem, illustrate this double allegiance. For many centuries there was some doubt as to which country Monmouthshire lay in.