Dyer is a city in Crawford County, Arkansas, United States. It is part of the Fort Smith, Arkansas-Oklahoma Metropolitan Statistical Area. The population was 876 at the 2010 census.

Crawford County is a county located in the Ozarks region of the U.S. state of Arkansas. As of the 2020 census, the population was 60,133. The county seat and largest city is Van Buren. Crawford County was formed on October 18, 1820, from the former Lovely County and Indian Territory, and was named for William H. Crawford, the United States Secretary of War in 1815.