The United States never had an organized territory named Ohio Territory. This term may refer to:

• Territory Northwest of the River Ohio, an organized incorporated territory of the United States in the Great Lakes region between 1787 and 1803
• Ohio Country, a vaguely defined colonial/frontier region, roughly covering the lands between the upper Ohio River and the Illinois Country (prior to 1787)
  • loosely, the Ohio River Valley in colonial times
• incorrectly or informally, lands within the boundary of the state of Ohio after statehood in 1803