Robert Emmet Tehan (January 7, 1905 – November 27, 1975) was an American attorney, Democratic politician, and United States federal judge.

He previously served twelve years in the Wisconsin Legislature.

Born in Milwaukee, Wisconsin, Tehan received an Artium Baccalaureus degree from Marquette University in 1927.

[2][3] Tehan was nominated by President Harry S. Truman on April 5, 1949, to a seat on the United States District Court for the Eastern District of Wisconsin vacated by Judge F. Ryan Duffy.

He was confirmed by the United States Senate on May 17, 1949, and received his commission two days later.