Politics and Business magazines
- IPALCO Enterprises, Inc.
- IPC Magazines Limited
- Ipiranga S.A.
- Ipsen International Inc.
- Ipsos SA
- IranAir
- Irex Contracting Group
- Irish Life & Permanent Plc
- Irkut Corporation
- iRobot Corporation
- Iron Mountain, Inc.
- IRSA Inversiones y Representaciones S.A
- Irvin Feld & Kenneth Feld Productions, Inc.
- Irwin Financial Corporation
- Irwin Toy Limited
- Iscor Limited
- Ishikawajima-Harima Heavy Industries Co., Ltd.
- Ishikawajima-Harima Heavy Industries Company, Ltd.
- Isle of Capri Casinos, Inc.
- Ispat Inland Inc.