Border states

Border states may refer to:
 * Limitrophe states, states bordering a given country, e.g. Russia
 * Border states (American Civil War), the five slave states that remained in the Union during the American Civil War (Delaware, Maryland, Kentucky, Missouri, and from 1863, West Virginia)
 * Border states (Eastern Europe), the newly independent countries (or "states") bordering the Soviet Union during the interwar period
 * International border states of the United States, U.S. states that border another country