Moyashel and Magheradernon () is a barony in the centre of County Westmeath, in Ireland, formed by 1672. It is bordered by eight other baronies: Corkaree and Fore (to the north), Delvin and Farbill (to the east), Fartullagh and Moycashel (to the south) and Rathconrath and Moygoish (to the west).
Moyashel and Magheradernon has an area of . The barony contains parts of two large lakes; Lough Ennell, shared with the barony of Fartullagh, and Lough Owel, an internationally recognised Ramsar waterfowl habitat. The River Brosna, rises in Lough Owel and is a tributary of the River Shannon. The N4, a national primary road passes through the barony to the north of Mullingar, connecting Dublin with the northwest of Ireland and the coastal town of Sligo. Railway lines carrying the national rail company Iarnród ÃÂireann's Dublin to Longford commuter service and Dublin to Sligo intercity service stop in the barony at Mullingar railway station. The Royal Canal passes through the town of Mullingar connecting the River Liffey in Dublin to Longford town.
This table lists an historical geographical sub-division of the barony known as the civil parish (not to be confused with an Ecclesiastical parish).
There are 100 townlands in the barony of Moyashel and Magheradernon.