The Irish state has officially approved the following list of national monuments in County Westmeath. In the Republic of Ireland, a structure or site may be deemed to be a "national monument", and therefore worthy of state protection, if it is of national importance. If the land adjoining the monument is essential to protect it, this land may also be protected.
The Hill of Uisneach or Ushnagh is a hill and ancient ceremonial site in the barony of Rathconrath in County Westmeath, Ireland. It is a protected national monument. It consists of numerous monuments and earthworks—prehistoric and medieval—including a probable megalithic tomb, burial mounds, enclosures, standing stones, holy wells and a medieval road. Uisneach is near the geographical centre of Ireland, and in Irish mythology it is deemed to be the symbolic and sacred centre of the island. It was said to be the burial place of the mythical Tuatha Dé Danann, and a place of assembly associated with the druids and the festival of Bealtaine.
Athlone Castle, sometimes known as Adamson Castle, is a castle located in Athlone, County Westmeath, Ireland, dating from the 12th century.
A national monument in the Republic of Ireland is a structure or site, the preservation of which has been deemed to be of national importance and therefore worthy of state protection. If the land adjoining the monument is essential to protect it, this land may also be protected.
Rathconrath, previously the barony of Rathcomyrta, before that Daltons country, is a barony in the west of County Westmeath, in Ireland. It was formed by 1542. It is bordered by County Longford to the north–west and five other Westmeath baronies: Moygoish to the north, Moyashel and Magheradernon to the east, Moycashel and Clonlonan to the south and Kilkenny West to the west. Note that the village of Rathconrath is not synonymous with the barony of the same name.