The Eleventh Wisconsin Legislature convened from January 13, 1858, to March 17, 1858, in regular session.
Senators representing even-numbered districts were newly elected for this session and were serving the first year of a two-year term. Assembly members were elected to a one-year term. Assembly members and even-numbered senators were elected in the general election of November 3, 1857. Senators representing odd-numbered districts were serving the second year of their two-year term, having been elected in the general election held on November 4, 1856.
The governor of Wisconsin during this entire term was Republican Alexander Randall, of Waukesha County, serving the first year of a two-year term, having won election in the 1857 Wisconsin gubernatorial election.
Members of the Wisconsin Senate for the Eleventh Wisconsin Legislature (30):
Members of the Assembly for the Eleventh Wisconsin Legislature: