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Fans of Tyrone (red-and-white) and Kerry (green-and-gold) flying assorted flags on All-Ireland day in Croke Park

The GAA county colours of a GAA county in Ireland are the colours of the kit worn by that county's representative team in the Gaelic Athletic Association's inter-county competitions, the most important of which are the All-Ireland Senior Football Championship and the All-Ireland Senior Hurling Championship. Flags and banners of these colours are waved by supporters at these matches; in the build-up to a major match, flags and bunting are flown or hung from buildings, telegraph poles, and other fixtures across the county, especially in those regions where GAA support is strong.

Dublin with navy shorts and Antrim in the traditional white shorts

Where a county's jersey is multi-coloured, these are the county colours. Where the jersey is a single colour, the colour of the shorts is also included. Shorts were formerly always white, but some counties adopted coloured shorts from the 1960s, such as Dublin's now familiar navy blue.

While each county council has a coat of arms, there are no official county flags. Flags with the GAA county colours serve as defacto county flags, at least in the Republic. However, there are no standardised formats for these, except Kildare whose flag, like their kit, is all-white. Typically, flags are formed as vertical bicolours or tricolours. The choice of which colour is nearest the hoist varies within a county. Moreover, horizontal stripes are used by some individuals. (This is common in County Offaly, where vertical county colours might be mistaken for the flag of Ireland; however other Offaly fans deliberately exploit this double significance.)

Flags with checkerboard, repeating stripes, and other patterns are also found. In recent years, flags have been commercially produced which feature the county's GAA logo on the flag. These logos are sometimes based on the official county coat-of-arms, but some have been replaced with unrelated designs. Fans may also wave other flags of the appropriate colours. For example, among the red-and-white flags used by individual Cork GAA supporters have been the flag of Canada and the ensign of the Imperial Japanese Navy. As Cork is nicknamed the "Rebel County", its fans have also flown the Rebel Flag of the American Civil War.

Flag	County	Description
	Galway	Maroon and White
	Leitrim	Green and gold
	Mayo	Green and Red
	Roscommon	Primrose and Blue
	Sligo	Black and white

Flag	County	Description
	Leinster Council	Green and White
	Carlow	Green, Red, and Yellow
	Dublin	Sky Blue and Navy blue
	Kildare	All White
	Kilkenny	Black and Amber
	Laois	Blue and White
	Longford	Blue and Gold
	Louth	Red and White
	Meath	Green and Gold
	Offaly	Green, White, and Gold
	Westmeath	Maroon and White
	Wexford	Purple and Yellow
	Wicklow	Blue and Gold

Flag	County	Description
	Clare	Saffron and Blue
	Cork	Red and White
	Kerry	Green and Gold
	Limerick	Green and White
	Tipperary	Blue and Gold
	Waterford	White and Blue

Flag	County	Description
	Antrim	Saffron and White
	Armagh	Orange and White
	Cavan	Blue and White
	Donegal	Green and Gold
	Down	Red and Black
	Fermanagh	Green and White
	Derry	Red and White
	Monaghan	White and Blue
	Tyrone	White and Red

Some areas outside Ireland are treated as "counties" by the GAA, and their representative teams naturally have standard kit colours like the Irish counties.

Flag	County	Description
	London	Green and White
	New York	Blue and White