The 73rd United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1933, to January 3, 1935, during the first two years of Franklin D. Roosevelt's presidency. Because of the newly ratified 20th Amendment, the duration of this Congress, along with the term of office of those elected to it, was shortened by 60 days. The apportionment of seats in the House of Representatives was based on the 1930 United States census.

The Twentieth Amendment to the United States Constitution moved the beginning and ending of the terms of the president and vice president from March 4 to January 20, and of members of Congress from March 4 to January 3. It also has provisions that determine what is to be done when there is no president-elect. The Twentieth Amendment was adopted on January 23, 1933.