West Cavan was a parliamentary constituency in Ireland, which from 1885 to 1922 returned one Member of Parliament (MP) to the House of Commons of the United Kingdom of Great Britain and Ireland.

Prior to 1885 the area was part of the Cavan constituency. After 1922, on the establishment of the Irish Free State, the area was not represented in the UK Parliament.

This constituency comprised the western part of County Cavan, consisting of the baronies of Clanmahon, Loughtee Lower, Tullyhaw and Tullyhunco, that part of the barony of Loughtee Upper contained within the parishes of Annagelliff, Castleterra, Kilmore and Urney and the townland of Crumlin in the parish of Denn, and that part of the barony of Tullygarvey contained within the parish of Annagh.