Frederick Louis Roehrig (1857 – 1948) was an early 20th-century American architect. Roehrig was born in LeRoy, New York, the son of the noted "orientalist and philoligist," Frederick L.O. Roehrig. He graduated from Cornell University in 1883 and also studied architecture in England and France. His architectural styles evolved over time, covering the Victorian, American Craftsman, and Neo-Classical styles. Roehrig is particularly known for his many landmark buildings in Pasadena, California, including the Hotel Green, and Pasadena Heritage has occasionally conducted tours of Roehrig's buildings.