Dewey William Johnson (March 14, 1899 – September 18, 1941) was an American lawyer and politician from Minnesota.

After graduation from law school, he began work in the insurance business.

After his six-year stint in the Minnesota House, Johnson served as Deputy Commissioner of Insurance and as the state Fire Marshal.

A second Congressional run in 1936 was successful; Johnson served as a member of the Farmer-Labor Party in the 75th congress, (January 3, 1937–January 3, 1939).

Johnson resumed his insurance practice in Minneapolis and also operated a retail radio sales business.