Frederick Ruple (September 19, 1871 - May 23, 1938) was a 20th-century Swiss-American painter, primarily of portraits. He was commissioned to paint Confederate Civil War battle scenes and murals. At times Ruple lived in Arkansas and Oklahoma where he traveled to study American Indians and early settlement in the Midwest. The Oklahoma Land Run of 1889 inspired Ruple to create his most famous painting "The Spirit of '89".