Border War may refer to:

• Paduan–Venetian border war (1372–1373)
• Border War or Bleeding Kansas (1854–1859), a series of violent events involving Free-Staters and pro-slavery elements prior to the American Civil War
• Border War (1910–1919), border conflicts between the United States and Mexico
• South African Border War (1966–1989) in Namibia and Angola
• List of border conflicts for wars fought on borders

• Border Wars (professional wrestling), an annual professional wrestling pay-per-view event
  • Border Wars (2012 wrestling event), the 2012 event
  • Border Wars (2013 wrestling event), the 2013 event

• Border War (Kansas–Missouri rivalry), officially known as the "Border Showdown" after September 11, 2001, the sports rivalry between the University of Kansas and the University of Missouri
• Border War (Colorado State–Wyoming rivalry), the sports rivalry between Colorado State University and the University of Wyoming
• Oregon–Washington football rivalry, the college football game played between the University of Oregon and the University of Washington
• Maine–New Hampshire men's ice hockey rivalry, the men's college ice hockey rivalry between the New Hampshire Wildcats and the Maine Black Bears

• Border War: The Battle Over Illegal Immigration, a 2006 documentary about the U.S.–Mexico border
• Border Wars (TV series), a television series on the National Geographic Channel
• Border Wars (album) an album by American rappers Berner and The Jacka

• Border Battle (disambiguation)