St. Eunan's Cathedral or the Cathedral of St. Eunan and St Columba as it is also known, is a Roman Catholic cathedral of the Diocese of Raphoe located in the parish of Conwal and Leck in Letterkenny, County Donegal, Ireland. It was built between the years of 1890 and 1900 and there are two Catholic cathedrals in the county; with , an older Roman Catholic cathedral of the same name is located in the town of Raphoe.
The Cathedral was commissioned by late Cardinal O'Donnell, then Bishop of Raphoe, who in 1888 aged 32 became the youngest bishop in the world at that time. The Cathedral, located on Castle Street opposite Conwal Parish Church in the town celebrated its centenary in 2001. The parish priests are Father Eamonn Kelly (Administrator), Father Eamonn McLaughlin and Father Philip Kemmy (curates), Father Johnathan Flood, Father Chambers and Father Rory Brady
The Cathedral opened on June 16, 1901 and is built in Victorian neo-Gothic style on a site overlooking the town. It was designed by William Hague, the well known Dublin architect and protégé of Pugin, and following Hague's death by his partner T. F. McNamara. . Saint Eunan's Cathedral has a spire with a height of 240 feet. White sandstone from Mountcharles was used in the construction. It was shipped along the coast and up the Swilly. Townspeople carried bucketloads of the sandstone to the construction site piece by piece. The cathedral is furnished in oak, with a marble pulpit by Pearse Brothers of Dublin. The pulpit depicts statues of the Four Masters and the Four Evangelists.