| Commonwealth Railways CN class | |
| Powertype: | Steam |
| Builder: | Montreal Locomotive Works |
| Builddate: | 1907-1908 |
| Totalproduction: | 8 |
| Fueltype: | Coal |
| Operator: | Commonwealth Railways |
| Fleetnumbers: | CN70-CN77 |
| Firstrundate: | November 1942 |
| Withdrawndate: | April 1952 |
| Disposition: | All scrapped |
The Commonwealth Railways CN class was a class of steam locomotives purchased by the Commonwealth Railways, Australia, from the Canadian National Railway (CN) during World War II, for use on the Trans-Australian Railway.
The eight locomotives in the class had been built in 1907-1908 by Montreal Locomotive Works, Montreal, Quebec, for the Canadian Northern Railways, and, after passing into CN ownership in 1918, had been part of CN's H6c class.