Ingalls was a small unincorporated community in eastern Payne County, Oklahoma, about east of Stillwater. The town was settled as a result of the "Unassigned Lands" land run in 1889, and had a post office from January 22, 1890, until October 31, 1907. It was named for Senator John J. Ingalls of Kansas. During the 1890s the population peaked at about 150, then began to decline.
Ingalls became notable as the site of the so-called Battle of Ingalls on September 1, 1893, which was a shootout between U.S. Marshals and the Doolin-Dalton gang. Three deputy marshals and two residents were killed, one of the residents being killed while shooting at the marshals. Several people were wounded, including two of the outlaws, and one outlaw was captured. A stone monument stands at Ingalls a short distance from where one of the deputies was shot.
A new post office, named Signet, Oklahoma, was established on the site of the old Ingalls post office on June 21, 1921, and became part of a new community named Signet, Oklahoma. By then the old town of Ingalls had ceased to exist. Only a few old buildings remained.
Only a few deserted old buildings are still present, including the Ingalls Hotel, a livery stable, saloon, and general store.