IOL may mean:

• Iol, an ancient city in Algeria, now Cherchell
• Independent Online, South African news website
• Institute of Linguists, UK, now Chartered Institute of Linguists
• International Linguistics Olympiad, an International Science Olympiad
• Intraocular lens, eye implant
• Ireland On-Line, a former internet service provider (ISP) in Ireland
• The University of New Hampshire InterOperability Laboratory (UNH-IOL), for networking testing
• Induction of labor, the process or treatment that stimulates childbirth

• IOI (disambiguation)
• LOL (disambiguation)