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- Ian Allan Publishing
- IDC Publishers an imprint of Brill
- Ignatius Press
- Imperial War Museum
- Indiana University Press
- Informa Healthcare
- Information Age Publishing (IAP)
- Insomniac Press Canada
- International Universities Press
- Inter-Varsity Press - IVP UK
- InterVarsity Press - IVP USA
- International Association of Engineers - Hong Kong
- Ishi Press
- Island Press
- Ivyspring International Publisher
Read more about this topic: List Of English-language Book Publishing Companies