James III may refer to:

• James III of Cyprus (1473–1474)
• James III of Majorca (c. 1315–1349)
• James III of Scotland (1451–1488)
• James Francis Edward Stuart (1688–1766), pretender who styled himself James III of England and Ireland, and James VIII of Scotland

• Oklahoma City (disambiguation)
• Oklahoma City Dodgers
• Oklahoma City Lightning
• Oklahoma City Memorial
• Oklahoma City National Memorial
• Oklahoma City, OK
• Oklahoma City University
• Oklahoma City Yard Dawgs
• Oklahoma City Yard Dawgz
• Oklahoma City Zoo and Botanical Garden
• Oklahoma City Zoological Park
• Oklahoma Council of Public Affairs
• Oklahoma County
• Oklahoma County, Oklahoma
• Oklahoma Coyotes
• Oklahoma (disambiguation)
• Oklahoma Gas & Electric
• Oklahoma Indian Welfare Act
• Oklahoma Land Race
• Oklahoma Land Rush
• Oklahoma Medical Research Foundation
• Oklahoma Memorial Stadium
• Oklahoma (musical)
• Oklahoma! (musical)
• Oklahoma Outlaws