Saxonburg is a borough (comparable to a town) in Butler County, Pennsylvania in the United States. It is part of the Pittsburgh metropolitan area in the western part of the state. It was founded in 1832 by F. Carl Roebling and his younger brother John A. Roebling as a German farming colony. The population of Saxonburg was 1,525 as of the 2010 census.
The city was first named "Germania" and "Sachsenburg" before its name was anglicized to the present one. After Roebling returned to his engineering career, he developed his innovation of wire rope in a workshop here. He became known for his design of suspension bridges, including the most famous one, the Brooklyn Bridge in New York.