The national flag of Ireland (Irish: bratach na hÉireann), frequently referred to in Ireland as 'the tricolour' (an trídhathach) and elsewhere as the Irish tricolour, is a vertical tricolour of green (at the hoist), white and orange.
flag of Ireland vertically striped green-white-orange national flag. Its width-to-length ratio is 1 to 2. A number of official and unofficial flags over the centuries have been flown in Ireland. One of the earliest, in use in the late 15th century, was blue with a gold harp; today it is the presidential standard of Ireland.