Daly, Marcus (1841–1900), a United States miner who founded the giant Anaconda Copper Mining Company (now The Anaconda Company). Daly, an Irish immigrant, discovered copper in Montana's Anaconda silver mine in 1882. He bought the mine and several others in the area and built an industrial and financial empire that included lumber mills, coal mines, railways, power plants, and banks.

Daly founded Hamilton, Montana. A bitter, bloody feud for control of Montana's mines and politics was fought by Daly and William Andrews Clark (1839–1925), a rival mine owner. The feud, in which Daly thwarted Clark time and again, began about 1888 and lasted until Daly's death.