The following list identifies every constituency used in Parliamentary etc. elections in Ireland (including Northern Ireland). The list consists of 'index names' for the seat and to identify what is potentially to be covered in a single constituency article.

The index name, which may vary from the official name or the name commonly used for a constituency in some respects, is constructed by putting the name of the geographical area first. If necessary (to distinguish between a borough constituency and a county constituency with the same geographical name) 'Borough', 'Cities', 'City' or 'Town' will be the second word of the Index Name to indicate the borough constituency. A compass point or more distinctive divisional name is to be placed next.

Special cases:

The institutions included in this list are: