The coat of arms of the London Borough of Hillingdon is the official symbol of the London Borough of Hillingdon. They use elements from the coats of arms of the four previous districts. It is described as:
Arms: Per pale Gules and Vert an Eagle displayed per pale Or and Argent in the dexter claw a Fleur-de-lis Or and in the sinister claw a Cog-Wheel Argent on a Chief Or four Civic Crowns Vert.
Crest: On a Wreath of the Colours issuant from a Circlet of Brushwood Sable a demi-Lion Gules with wings Argent the underside of each wing charged with a Cross Gules and holding between the paws a Bezant thereon a Mullet Azure.
Supporters: On the dexter side an Heraldic Tiger Or gorged with an Astral Crown Azure and charged on the shoulder with a Rose Gules charged with another Argent barbed and seeded proper and on the sinister side a Stag proper attired and gorged with a Circlet of Brushwood and charged on the shoulder with two Ears of Rye slipped in saltire Or.
Motto: Forward.
The four green civic crowns or wreaths on the shield proclaim the equal status of the four old borough and urban districts within the new Borough. The motto 'Forward' was chosen from the old Hayes and Harlington coat of arms.
The eagle at the centre of the shield was taken from the old arms of Uxbridge Borough Council and Yiewsley and West Drayton Urban District Council. It was adapted by them from the arms of the Paget family, historic lords of the manor of West Drayton and later Earls of Uxbridge. The tiger supporting the shield on the left is also taken from the Paget family arms. The fleur de lys (or lily) on the left of the shield is from the arms of Ruislip-Northwood, and commemorates the fact that the manor of Ruislip was held for much of its history by the Abbey of Bec and then King's College, Cambridge, for both of whom the lily was a symbol of religious purity.