3I

3I or 3-I may refer to:

• Iniziative Industriali Italiane
  • 3I Sky Arrow
• 3i London-based private equity and venture capital company
• 3-I League, see Illinois–Indiana–Iowa League
• 3i Infrastructure, an investment business headquartered in Jersey
• 3i Infotech Limited, an Indian IT company
• ESX Server 3i, a version of VMware ESX