Sydney Mines
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  Sydney Mines Location of Sydney Mines, Nova Scotia | |
| Coordinates: 46°14′15″N 60°13′10″W / 46.23750°N 60.21944°W | |
| Country | Canada |
| Provinces of Canada | Nova Scotia |
| Regional Municipality | Cape Breton Regional Municipality |
| Incorporated Town | 1889 |
| Amalgamated | August 1, 1995 |
| Population (2021) From Statistics Canada | |
| • Total | 12,353 |
| Time zone | UTC-4 (AST) |
| • Summer (DST) | UTC-3 (ADT) |
| Canadian Postal code | B1V |
| Area code | 902 |
Sydney Mines (Mi'kmawi'simk: Klmuejuapskwe'katik; Scottish Gaelic: Mèinnean Shidni) is a community and former town in Cape Breton Regional Municipality, Nova Scotia, Canada.
Founded in 1784 and incorporated as a town in 1889, Sydney Mines has a rich history in coal production although mining activity has now ceased. Prior to a permanent settlement being established, there was significant activity along the shore. Upon the success of coal mining operations, the Nova Scotia Steel and Coal Company constructed a steel plant in Sydney Mines in 1902. The plant, alongside the steel plant in Sydney owned by the Dominion Iron and Steel Company combined to produce more than 50% of Canada's steel during World War I. The plant was later sold to the British Empire Steel Corporation and ceased operations years later.