IDG or IdG may refer to:
- IDG Ventures, a family of venture funds originally funded by International Data Group
- Apple Industrial Design Group, part of Apple Inc.
- Indigo Books and Music, a Canadian retail bookstore chain
- Industrial Development Group, a South African mining company headed by Makaziwe Mandela
- International Deployment Group, a department of the Australian Federal Police
- International Data Group, an American technology, media, research, event management, and venture capital organization.