3I
# 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
