Farbill (Irish: Fir Bhile)[1] is a barony in east County Westmeath, in Ireland.

[2] It is bordered by County Meath to the south and east and three other baronies: Fartullagh (to the south–west), Moyashel and Magheradernon (to the north–east) and Delvin (to the north).

To the north the R156 passes through Killucan linking the N3 near Clonee in County Meath to the N4 (near Mullingar).

A railway line carrying the national rail company Iarnród Éireann's Dublin to Longford commuter service and Dublin to Sligo intercity service.

The Royal Canal follows a similar route through Farbill connecting the River Liffey in Dublin to Longford town.