St Columb's Cathedral in the walled city of Derry, Northern Ireland is the mother church of the Church of Ireland Diocese of Derry and Raphoe and the parish church of Templemore.

It is dedicated to Saint Columba, the Irish monk who established a Christian settlement in the area before being exiled from Ireland and introducing Christianity to Scotland and northern England. The present structure, located close to the original, was completed in 1633 by William Parrot, in the Planter's Gothic style. Also in the porch is an inscription:

If stones could speake
then London's prayse
should sound who
built this church and
cittie from the grounde.