The right to utilise a Coat of Arms was first conferred on the former Royal Borough of Kingston upon Thames in 1572. The present Coat of Arms was granted by letters patent in March 1966, following the amalgamation of the former Boroughs of Kingston upon Thames, Surbiton and Malden and Coombe in the previous year. The present Coat of Arms combines elements of those three former Boroughs.

Crest - On a wreath of the Colours Issuing from a wreath of Bay Leaves Vert Banded Or a demi Stag proper gorged with a Crown Or pendent therefrom an Escutcheon Ermine on a Chevron Vert between two Chevronels the upper one per pale Azure Gules and the lower one per pale Gules and Azure Cross Pattee Or (the Arms of the former Borough of Malden and Coombe) holding between the forelegs a Fountain.
Supporters - On either side a Stag proper gorged with a Riband Argent pendent therefrom an Escutcheon Azure issuant from the base an Elm Tree proper in front of a sun rising Or (the Arms of the former Borough of Surbiton) and resting the interior hind hoof on a charred Woodstock the whole upon a Grassy Mount proper supported by a Fillet wavy per fess wavy Argent and Azure.
Badge - A roundel of the Arms encircled by a wreath of elm and bay Vert tied with a riband and ensigned by a Saxon Crown Or.
The crest consists of that of the former Borough of Malden and Coombe, with the addition of the boroughs shield hanging from the crown about the stag's neck. The shield has reference to Malden and Coombe's connections with the Crown and Merton College, Oxford, and the stag is a reminder that part of Richmond Park is within the area.
The supporters are those of the former Borough of Surbiton, with its shield hanging from their necks. The elm in the shield recalls the ancient Hundred of Elmbridge, and the stags, which link thematically with that in the new crest, are those of the Coutts family.
The whole coat of arms rests on a grassy base edged with waves, symbolising the Royal Borough's situation on the Thames, and preserves virtually intact the heraldry of all the constituent boroughs.
The badge displays the Kingston salmon surrounded by leaves from the Surbiton elm and the Malden and Coombe bay, and surmounted by a Saxon crown in reference to the Royal Borough's title.