List of Irish counties' coats of arms

The following is a list of Irish counties' coats of arms. In the majority of cases these are arms assigned to county councils created by the Local Government (Ireland) Act 1898 or later legislation, either by the Chief Herald of Ireland in what is now the Republic of Ireland or the College of Arms in Northern Ireland. All but two county councils in the Republic has a coat of arms. In Northern Ireland county councils were abolished in 1973, but the traditional arms are still occasionally used.

In unofficial symbolisation of a county, the arms of its county town have sometimes been used instead of those of its county council, or when the council had no arms. There are no official county flags. Flags with the GAA county colours serve as de facto county flags. County flags flown in Dublin Castle incorporate the county council arms, while those sold by the GAA county board include the county GAA crest. Coats of arms granted in recent decades often incorporate the GAA colours in the field.

The earliest Irish county arms date from the late 17th century, when those of counties Carlow, Kilkenny and "Typerary" were recorded by Richard Carney, Ulster King of Arms. In each case the arms consist of an ermine shield bearing a fesse or central horizontal band on which heraldic devices of local families are displayed. The arms of Tipperary became obsolete when the county was divided into North and South Ridings in 1838.

When county councils were established in 1899, each was obliged to adopt a seal. In some cases these used an unofficial coat of arms, but no arms were officially granted prior to the splitting of heraldic jurisdiction in 1943.

In 1914 a system of county and city flags were designed as unit colours for the Irish Volunteers. Each county flag was to include a coat of arms, with a list of suggested designs drawn by The O'Rahilly. While few of these colours were ever manufactured, some of the county devices were later to occur in official grants.

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