Armstrong is an unincorporated community in Kenedy County, Texas, United States.

Situated on U.S. Route 77, it was established in 1914, when the Missouri Pacific Railroad was extended to it.

The community was named for John Barclay Armstrong, who established Armstrong Ranch nearby, in 1893.

A post office called Katherine was established in 1913, before being renamed in 1915.

[3] This article about a location in Kenedy County, Texas is a stub.