The Ninth Wisconsin Legislature convened from January 9, 1856, to March 31, 1856, in regular session, and re-convened from September 3, 1856, to October 14, 1856. Senators representing even-numbered districts were newly elected for this session and were serving the first year of a two-year term. Assemblymembers were elected to a one-year term. Assemblymembers and even-numbered senators were elected in the general election of November 6, 1855. 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 7, 1854.