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
• Inner Development Goals Foundation, a non-profit, open-source initiative committed to fostering inner development towards more sustainable futures.
• International Deployment Group, a department of the Australian Federal Police
• International Data Group, an American technology, media, research, event management, and venture capital organization.

• Integrated Drive Generator, an aircraft electrical generation unit
• Indo-Germanic
• The IATA code for Ida Grove Municipal Airport, an airport in Iowa, USA
• Infinite derivative gravity, a theory of modified gravity