John Jacob Senn (March 28, 1828 – May 20, 1893) was a member of the Wisconsin State Assembly.
Senn was born in Toggenburg, Switzerland in March 1828, sources have differed on the exact date.
Jobs Senn held up to that point include that of teacher.
During the American Civil War, Senn enlisted with the 9th Wisconsin Volunteer Infantry Regiment of the Union Army.
Later, he became involved in the insurance industry, including working as an agent.