| St. Mary's Cathedral | |
| Pushpin Map: | USA New York |
| Pushpin Label Position: | none |
| Map Caption: | Location in New York |
| Coordinates: | 44.6988°N -75.4857°W |
| Location: | 415 Hamilton St. Ogdensburg, New York |
| Country: | United States |
| Denomination: | Roman Catholic Church |
| Founded Date: | 1827 |
| Consecrated Date: | October 22, 1952 |
| Style: | Gothic Revival |
| Completed Date: | 1952 |
| Diocese: | Ogdensburg |
| Bishop: | Most Rev. Terry R. LaValley |
| Rector: | Rev. Joseph A. Morgan |
St. Mary's Cathedral is a Catholic cathedral 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]