Hermann Ottomar Herzog (November 16, 1832 – February 6, 1932) was a prominent nineteenth- and early twentieth-century European and American artist, primarily known for his landscapes. He is associated with the Düsseldorf School and Hudson River School of painting. He almost always signed his work "H. Herzog"; as a result of this and the Americanization of spelling "Herman," his first name is spelled both "Herman" and "Hermann" in various sources. "Hermann," however, is the way he signed his name on documents.