Martin Maginnis (October 27, 1841 – March 27, 1919) was a nineteenth-century politician, soldier, publisher, editor and miner from Minnesota and the Montana Territory.

[1] After mixed success in business, Patrick and Winifred Maginnis immigrated to the United States in 1838 and settled in Wayne County, New York.

[2] Young Maginnis pursued an education in the public schools and in Minnesota he attended Hamline University, but left early to take charge of a Democratic newspaper.

[5] Colvill took young Maginnis under his wing, liberally sharing his library with him and enjoying together the abundant hunting and fishing in the area.

Afterwards, he was unsuccessful in being elected back to the House of Representatives in 1890, was Commissioner of Mineral Land of Montana from 1890 to 1893 and presented his credentials as a Senator-designate in 1900 to fill a vacancy, but was not seated.