Lorenzo Janes (September 18, 1801 – June 25, 1873) was an American lawyer, judge, businessman, and territorial legislator.
In 1836, Janes moved to Racine, Wisconsin Territory and continued to practice law.
He also served as a colonel on the military staff of Wisconsin Territorial Governors Henry Dodge and James D. Doty.
His son, David G. Janes, succeeded in control of his business affairs, and was later elected Mayor of Racine.
Another son, George S. Janes, died in the American Civil War.