St. Mary's Cathedral is a Catholiccathedral located in Ogdensburg, New York, United States. It is the seat of the Diocese of Ogdensburg.[1] St. Mary's parish was founded in 1827. The original St. Mary's Cathedral was located at Montgomery and Franklin Streets.[2] The cornerstone was laid in 1855 and it was destroyed in a fire on November 25, 1947. The current cathedral was completed in 1952 and consecrated on October 22 of that year.[3]