The Cathedral of Our Lady Assumed into Heaven and St Nicholas (Irish language: Ard-Eaglais Mhaighdean na Deastógála agus Naomh Nioclás), commonly known as Galway Cathedral, is a Roman Catholic cathedral in Galway, Ireland, and is one of the largest and most impressive buildings in the city.

Construction began in 1958 on the site of the old city jail, In 1965, it was dedicated, jointly, to Our Lady Assumed into Heaven and to St. Nicholas.

The Architect of the Cathedral was John J. Robinson who had previously designed many churches in dublin and around the country. The architecture of the Cathedral draws on many influences. The dome and pillars reflect a Renaissance style. Other features, including the rose windows and mosaics, echo the broad tradition of Christian art. The Cathedral dome, at a height of 44.2 metres (145 ft), is a prominent landmark on the city skyline