William Robert Allen (January 1, 1849 – October 11, 1928) was an early 20th-century architect in Utah. His most important work, the Davis County Courthouse, is no longer extant, yet a number of his works are listed on the U.S. National Register of Historic Places. Allen received training through the International Correspondence Schools which was based in Scranton, Pennsylvania, but allowed him to receive training and continue work in Utah.
