William Ross Scott, 97, a retired Army infantry colonel who served in both World Wars, died of pneumonia Sunday at the Wisconsin Avenue Nursing Home.

A native of Indianapolis, Col. Scott graduated in 1904 from the Military Academy at West Point.

He served two tours of duty in the Philippines and went to France with the American Expenditionary Force during World War I. After the Armistice, he served as assistant chief of staff of the 1st Infantry Division with the U.S. occupation forces in the Rhineland.

Between the wars, Col. Scott served in this country and in Hawaii.

During World War II, Col. Scott served as chief of staff of the 7th Infantry Division and the 3rd Army Corps at Fort Ord, Calif.

He was a graduate of the Command and General Staff School at Fort Leavenworth, Kan., and the Army Industrial College here. He also had served as professor of military science and tactics at Davidson College in North Carolina and at Oregon State University.

Following his military retirement in 1944, he moved to Washington and worked for six years as an official of the Army Emergency Relief.

Survivors include two daughters, Isabel Bowen, of Fort Smith, Ark., and Heistand Underwood, of Arlington; six grandchildren, and nine great-grandchildren.