King's County Birr (UK Parliament constituency)

King's County Birr
Former County constituency for the House of Commons
1885–1918
Number of members	one
Replaced by	King's County
Created from	King's County

Birr, a division of King's County, was a UK Parliament constituency in Ireland, returning one Member of Parliament 1885–1918.

Prior to the United Kingdom general election, 1885 and after the dissolution of Parliament in 1918 the area was part of the King's County constituency.

This constituency comprised the south-western part of King's County now known as County Offaly. It consisted of the baronies of Ballycowan, Ballyboy and Eglish, Ballybritt, Clonlisk and Garrycastle.