Armstrong is a town in Bryan County, Oklahoma, United States, along the Blue River.

[4] The town was named for Frank C. Armstrong, a member of the Dawes Commission.

At the time of Armstrong's founding it was located in Blue County of the Choctaw Nation.

[6] The Oklahoma Office of the Game Warden (now the Department of Wildlife Conservation) established a fish hatchery in the town about 1916.

Otherwise the town survived economically by serving small farms in the area and catering to the needs of sport fishermen who were attracted to the Blue River and nearby Lake Texoma, By 1980, the town had 133 residents.

[6] According to the United States Census Bureau, the town has a total area of 0.1 square miles (0.26 km2), all land.