The Sixty-Third Wisconsin Legislature convened from January 13, 1937, to July 2, 1937, in regular session, and reconvened in a special session from September 15, 1937, to October 16, 1937.

[1] This was the high water mark for the power of the Wisconsin Progressive Party, as they controlled both chambers of the Legislature and the Governor's office.

Senators representing even-numbered districts were newly elected for this session and were serving the first two years of a four-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 6, 1934.

[1] The governor of Wisconsin during this entire term was Progressive Philip La Follette, of Dane County, serving his third two-year term, having won re-election in the 1936 Wisconsin gubernatorial election.