Harold Knutson was an American politician and journalist who represented Minnesota in the United States House of Representatives from 1917 to 1949 as a member of the Republican Party. From 1919 to 1923 he was the Republican majority whip.

The 66th United States Congress was a meeting of the legislative branch of the United States federal government, comprising the United States Senate and the United States House of Representatives. It met in Washington, D.C., from March 4, 1919, to March 4, 1921, during the last two years of Woodrow Wilson's presidency. The apportionment of seats in the House of Representatives was based on the 1910 United States census.