William August Rodenberg (October 30, 1865 – September 10, 1937) was a U.S. Representative from Illinois. Born near Chester, Illinois, the son of German immigrants, Rodenberg attended the public schools. He graduated from Central Wesleyan College, Warrenton, Missouri, in 1884. He taught school for seven years. He attended the St. Louis Law School. He was admitted to the bar in 1893 and commenced practice in East St. Louis, St. Clair County, Illinois. He served as delegate to the Republican National Conventions in 1896, 1908, 1916, and 1920.