The Fifty-Fifth Wisconsin Legislature convened from January 12, 1921, to July 14, 1921, in regular session, and re-convened in a special session in March 1922.

[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 5, 1918.

[1] The governor of Wisconsin during this entire term was Republican John J. Blaine, of Grant County, serving a two-year term, having won election in the 1920 Wisconsin gubernatorial election.