The Fifty-Ninth Wisconsin Legislature convened from January 9, 1929, to September 20, 1929, in regular session.

[1] Senators representing even-numbered districts were newly elected for this session and were serving the first two years of a four-year term.

Assembly members were elected to a two-year term.

Senators representing odd-numbered districts were serving the third and fourth year of a four-year term, having been elected in the general election of November 2, 1926.

[1] The governor of Wisconsin during this entire term was Republican Walter J. Kohler Sr., of Sheboygan County, serving a two-year term, having won election in the 1928 Wisconsin gubernatorial election.