The 59th Illinois General Assembly met from 1935 to 1937.

Thomas Donovan of Joliet was the Lieutenant Governor of Illinois and thus ex officio President of the Senate.

[a] Richey V. Graham of Chicago was President pro tempore of the Senate.

John P. Devine of Dixon was the Speaker of the House of Representatives.

Illinois was divided into 51 districts, each of which elected one Senator and three Representatives.