Baggotrath Castle, Medieval castle in Dublin, Ireland.

Baggotrath Castle stood at what is now 44-46 Upper Baggot Street, facing Waterloo Road, in Dublin city centre. Built from the late thirteenth century by the Bagod family, it was held for much of its history by the Fitzwilliams. In the 1640s it was described as the strongest fortress near Dublin; no trace of it survives today.

Sir Robert Bagod, Chief Justice of the Irish Common Pleas, bought the land from Nicholas de Hyntenberge around 1280 and built the castle, which passed to the Fitzwilliam family. In 1441 James Cornwalsh, Chief Baron of the Irish Exchequer, was murdered there while at supper, and the castle was described as ruinous in 1489 before being rebuilt. Partly destroyed by Colonel Michael Jones in 1649, it was finally demolished by Dublin Corporation in the early nineteenth century.

The castle's name shaped Dublin's urban layout, with street names like Baggot Street and Baggotrath Lane carrying forward the memory of what once stood here.

The castle stood at what is now 44-46 Upper Baggot Street, facing Waterloo Road. Nothing remains above ground, so the spot can only be identified by the street layout and the nearby Baggotrath Lane, which keeps the name.

On 1 August 1649 Ormonde sent 1,500 men to fortify the castle, but they took the whole night to cover about a mile, and Ormonde found nothing done. Michael Jones then attacked with some 5,000 men; the Royalist cavalry deserted and most foot soldiers were killed or captured.