William Alvin Pittenger (December 29, 1885 – November 26, 1951) was a United States Representative from Minnesota's 8th congressional district. He was born on a farm near Crawfordsville, Montgomery County, Indiana and attended rural schools. Pittenger graduated from Wabash College, Crawfordsville, Indiana, in 1909, and from Harvard Law School in 1912. He was admitted to the bar in 1912 and opened a law practice in Duluth, Minnesota.