| Northwest Catholic District School Board | |
| Native Name: | TNCDSB |
| Region: | Sioux Lookout, Dryden, Atikokan, Fort Frances, Stratton |
| Country: | Canada |
| Location: | 555 Flinders Ave Fort Frances, ON P9A 3L2 |
| Coordinates: | 48.6106°N -93.4223°W |
| Chair Of The Board: | Kathy Bryck |
| Director Of Education: | Jackie Robinson |
| Free Label1: | Elected trustees |
| Free Text1: | 9 |
| Schools: | 5 elementary[1] |
| District Id: | B29041 |
The Northwest Catholic District School Board (TNCDSB, known as English-language Separate District School Board No. 33A prior to 1999[2]) is a separate school board in Ontario serving the Rainy River District and portions of the Kenora District.
TNCDSB operate corporate offices in Fort Frances and business offices in Dryden.
The five elementary schools operated by TNCDSB are: Our Lady of the Way School in Morley; Sacred Heart School in Sioux Lookout; St. Joseph's School in Dryden; St. Patrick's School in Atikokan; and St. Mary School in Fort Frances.
TNCDSB does not operate any secondary schools.
TNCDSB amalgamated the Atikokan Roman Catholic Separate School Board as of September 1, 2009.[3]