Francis Steffen (November 5, 1836 – December 15, 1879) was an American farmer from Hortonville, Wisconsin who spent two terms as a member of the Wisconsin State Assembly from Outagamie County, being elected first as a "Reform Democrat" and then re-elected as a Democrat.
Steffen entered the 32nd Wisconsin Volunteer Infantry Regiment in August, 1862; was with Ulysses S Grant in the Vicksburg Campaign in 1862–63; marched with William Tecumseh Sherman on the Meridian, Mississippi campaign in 1864: took part at the Siege of Atlanta and the Battle of Jonesborough; marched with Sherman to the sea and into South and North Carolina; took part in all the engagements with the command; marched through Washington, took part in the Grand Review of the Armies in May, 1865, and in June 1865 was mustered out.
After the war he married Isabella McMurdo Steffen (1845–1926), born in New Brunswick but raised in Hortonville.
Steffen held various local offices, having been five times elected chairman of his town without opposition.
He was elected clerk of the circuit court in 1866, and chairman of the county board of supervisors in 1877.