Tyrrellspass Castle, Medieval tower house in Tyrrellspass, Ireland

Tyrrellspass Castle is a stone tower house about 20 metres high, southwest of the village of Tyrrellspass in County Westmeath, built up of superimposed chambers reached by an original spiral staircase. A murder-hole beside the entrance door let defenders attack intruders. Since the early 1990s the building has housed a restaurant, and an original roof beam is exposed in its lounge.

Tyrrellspass Castle dates from around 1411 and is the only surviving castle of the Tyrrells, who came to Ireland at the time of the Norman invasion. In 1597 Captain Richard Tyrrell, an ally of Hugh O'Neill, defeated English crown forces nearby at the Battle of Tyrrellspass. During the Cromwellian invasion of 1650 the occupants suffered greatly and many were executed; the Rochfort family, later Earls of Belvedere, acquired the castle soon after. In 1796 the 2nd earl leased it to the army as a barracks, and in 1850 it passed to Charles Brinsley Marlay, then to Lieutenant-Colonel Charles Howard-Bury.

The castle has housed a restaurant since the early 1990s, now called Tyrrellspass Castle Restaurant, and it also hosts medieval banquets. The building is known in Irish as Caisleán Bhealach an Tirialaigh, and the village's modern name, Tyrrellspass, replaced the older Fartullagh (Fir Thulach).

The tower house stands southwest of Tyrrellspass village in County Westmeath, about 20 metres tall, with the entrance door flanked by a murder-hole. The building now serves as Tyrrellspass Castle Restaurant, which also hosts medieval banquets, so booking ahead is wise for those events.

An exposed roof beam dating from 1280 remains visible in the restaurant lounge as a structural element, predating the castle's formal construction by more than a century. This timber offers a tangible link to building practices from an earlier era.