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.

NM#	Monument name	Description	Image	Townland	Location
520	Athlone Castle	Castle		Athlone	53°25′23″N 7°56′34″W / 53.423161°N 7.942875°W / 53.423161; -7.942875
481	Delvin Castle	Castle		Delvin	53°36′40″N 7°05′37″W / 53.611222°N 7.093569°W / 53.611222; -7.093569
560	Dunnamona	Motte		Dunnamona	53°29′58″N 7°47′01″W / 53.499541°N 7.783672°W / 53.499541; -7.783672
610	Mortimer's Castle	Castle		Faughalstown	53°38′55″N 7°20′26″W / 53.648720°N 7.340677°W / 53.648720; -7.340677
220	Fore town gates	Town gates		Fore	53°40′45″N 7°13′32″W / 53.679206°N 7.225675°W / 53.679206; -7.225675
215	Fore Abbey	Abbey (Benedictine) & hermitage		Fore	53°41′02″N 7°13′38″W / 53.683939°N 7.227133°W / 53.683939; -7.227133
265	Taghmon Church	Church		Glebe	53°36′03″N 7°15′59″W / 53.600889°N 7.266459°W / 53.600889; -7.266459
213	Inchbofin	Early Medieval Ecclesiastical Site		Inchbofin	53°32′30″N 7°55′03″W / 53.54156°N 7.91742°W / 53.54156; -7.91742
155	Ushnagh Hill, Catstone	Ringfort, Barrow & Stone		Ushnagh Hill	53°29′18″N 7°33′44″W / 53.488356°N 7.562087°W / 53.488356; -7.562087
624	Portlick Motte	Motte		Portlick	53°29′28″N 7°54′38″W / 53.491193°N 7.910627°W / 53.491193; -7.910627
572	Raharney Ringfort	Ringfort		Raharney	53°31′18″N 7°06′15″W / 53.52172°N 7.10428°W / 53.52172; -7.10428
223	Bealin High Cross	High Cross		Twyford	53°26′07″N 7°50′42″W / 53.435149°N 7.844919°W / 53.435149; -7.844919
606	Wattstown Barrows	Two Barrows (tumuli)		Wattstown	53°34′32″N 7°26′06″W / 53.57565°N 7.43506°W / 53.57565; -7.43506

• National Monuments in County Westmeath