The Cathedral of the Immaculate Conception of Our Lady in Sligo is the seat of the Catholic bishop of the local diocese. It is a neo-Romanesque temple built in the second half of the 19th century. The cathedral was erected on a cross plan with a square tower above the entrance. In the main altar, under the canopy, there is a statue of the Mother of God.
The cathedral was opened in 1874. It was built according to the design of George Goldie, an English architect who designed many Catholic churches in Ireland at that time. It is a neo-Romanesque building, referring to English churches from the period of the Norman invasion. The temple is a three-nave with a transept and a semicircular closed chancel. A massive four-storey tower with rows of Romanesque arched windows in the upper storeys adjoins the nave from the entrance.
The interior is divided into aisles by round columns with decorated capitals and a gallery. In the presbytery there are five windows filled with stained glass. There is a canopy decorated with geometric ornaments, under which there is a stone sculpture of Our Lady of the Immaculate.