| Viscountcy Dunrossil | |
| Alt: | |
| Creation Date: | 13 November 1959 |
| First Holder: | William Morrison |
| Present Holder: | Andrew Morrison |
| Heir Apparent: | Callum Morrison |
| Remainder To: | the 1st Viscount's heirs male lawfully begotten |
| Status: | Extant |
Viscount Dunrossil, of Vallaquie in the Isle of North Uist in the County of Inverness, is a title in the Peerage of the United Kingdom. It was created on 12 November 1959 for the Conservative politician William Morrison upon his retirement as Speaker of the House of Commons. His son, the second Viscount, notably served as High Commissioner to Fiji and as Governor of Bermuda. the title is held by the latter's son, the third Viscount, who succeeded in 2000.
The viscountcy is the most recently created hereditary peerage created for a former Speaker which is still extant; all Speakers of the Commons after the 1st Viscount either received life peerages, died in office, or, having received a hereditary peerage, died without issue.
The family seat is Dunrossil House, near Lochmaddy, Isle of the North Uist.
The heir apparent is the present holder's son, the Hon. Callum Alasdair Brundage Morrison (born 1994)
| William Morrison, 1st Viscount Dunrossil (except Scotland) | |
| Notes: | Earl Marshal’s Warrant 14 July 1952, Granted 14 August 1953. Agent Richmond Herald. Grants: 115 / 188. |
| Escutcheon: | Azure on a Pale Ermine between two Gannets reversed volant to the dexter their wings expanded palewise proper a representation of the Mace of the House of Commons Or. |
| Crest: | A Viking galley with one mast and sail furled proper flying from the masthead a pennon Argent charged with a raven volant Sable. |
| Motto: | An Tighnearna Mo Bhuachaille (The Lord is my Shepherd)[1] |
| William Morrison, 1st Viscount Dunrossil (in Scotland) | |
| Escutcheon: | Per bend sinister Gules and Argent a Demi-Lion rampant issuant Or armed and langued Azure holding in his paws a Battleaxe the Shaft curved of the third and the Axehead of the fourth in chief and in base issuant from the Sea undy Vert and Or a Tower Sable Windows and Port Or over all a Bend sinister embattled Azure charged with an Open Crown Or jewelled Gules between two Fleurs-de-lys Argent; within a Bordure Vert for difference. |
| Crest: | Issuant from waves of the Sea Azure crested Argent a Mount Vert thereon an embattled Wall Azure masoned Argent charged with a Portcullis Or and issuant therefrom a Cubit Arm naked proper the hand grasping a Dagger Azure hilted Or |
| Supporters: | On either side a Lion regardant Or armed and langued Gules collared Vert supporting between the exterior forepaw and interior hindpaw a Battleaxe Azure the shaft embowed |
| Motto: | Above the Crest: Teaghlach Phabbay (The household or family of Phabbay); Below the Shield: An Tighnearna Mo Bhuachaille (The Lord is my Shepherd) |
| Coronet: | Coronet of a Viscount |
| Notes: | Petition to Lord Lyon 17 December 1959, matriculated 18 April 1960. (College of Arms: Scotland IV 143).[2] |