Moycashel (Irish: Maigh Chaisil), previously the barony of Rossaughe, and before that, Delamares country, is a barony in south County Westmeath, in the Republic of Ireland. It was formed by 1542. It is bordered by three other baronies: Clonlonan to the west, Rathconrath to the north, Moyashel and Magheradernon to the north-east and Fartullagh to the west. The largest population centre is Kilbeggan.