Claude Rodman Porter (July 8, 1872 – August 17, 1946) was an American politician. He served on the Iowa General Assembly, served as a United States Attorney, and was perennial Democratic runner-up to Republican victors in three races for Iowa governor and six races for U.S. senator. In an era in which Republicans in Iowa won so often that Senator Jonathan P. Dolliver remarked that "Iowa will go Democratic when Hell goes Methodist," Porter twice came closer to winning the governorship than all but one other Democratic candidate of that era. He later served as a member of the U.S. Interstate Commerce Commission for eighteen years.