Glenwood is a city in Pike and Montgomery counties in Arkansas, United States. As of the 2020 census, its population was 2,068. The community is located along the Caddo River in the Ouachita Mountains. Glenwood was formed as a boomtown following the development of the Gurdon and Fort Smith Railroad and timber interests in the area. After the establishment of a lumber mill, the community received a post office and incorporated in April 1909.