- Gagnon city refers to the former mining town of Gagnon, Quebec, Canada. It was established in the late 1950s to support the mining operations of the Iron Ore Company of Canada (IOC). The town was named after IOC's first president, Joseph-Armand Bombardier's father-in-law, Philippe Gagnon.
- Gagnon city was a company town, meaning it was built and managed by IOC to house its employees and their families. It had all the necessary facilities, including schools, a hospital, a community center, and recreational areas. The town also had its own transportation system, including a highway and an airport, to facilitate movements in and out of Gagnon.
- During its peak, Gagnon city had a population of about 4,500 people. However, due to the decline in mining activity and subsequent closure of the town's mine in 1985, the population dwindled, leading to many residents relocating to other areas. Today, Gagnon city is largely abandoned, with only a few residents remaining.
- Despite its decline, Gagnon city is still recognized for its contribution to Canada's iron mining industry and its impact on the local community.