Frederick Augustus Muhlenberg II, FAIA was a leading architect, an American military and political leader who served as a U.S. Congressman from Pennsylvania, and a member of the Muhlenberg political dynasty.

During World War I, Muhlenberg was a captain in the 314th Infantry Regiment serving from September 1917 to March 1919. He was awarded the Distinguished Service Cross, the Purple Heart, the Legion of Merit, the Verdun Medal, the Légion d’Honneur and the Croix de guerre with Palm for his actions in World War I.

Muhlenberg served continuously in the regular army reserves for more than 20 years. He re-entered the United States Army in 1940, where he served during World War II as a Lieutenant colonel and Colonel in the United States Army Corps of Engineers, as an aide to Gen. Brehon Summervell, and as district engineer in Cincinnati.

In 1946, Muhlenberg was elected to the 80th Congress from Pennsylvania. He became the seventh member of his family to be elected to the U.S. Congress, where he served in the House of Representatives from January 3, 1947 until January 3, 1949.