The First Wisconsin Legislature convened from June 5, 1848, to August 21, 1848, in regular session.

Members of the Assembly and Senate were elected after an election on February 1, 1848, that ratified the proposed state constitution.

Wisconsin's first governor, Democrat Nelson Dewey, of Grant County, was sworn in on the 3rd day of this legislative term.

He was the only governor of Wisconsin during this legislative term.

Members of the Wisconsin Senate for the First Wisconsin Legislature (19):[2][3] Members of the Assembly for the First Wisconsin Legislature (66):[2][3]