IBB

• Indiana Business Bulletin, a business-news website
• Internet Bug Bounty, a Bug bounty program for Internet-related software

• Institute of Bioinformatics and Biotechnology, a scientific research institute in Pune, India
• Institute of Biochemistry and Biophysics, a research institute in Iran
• Ibrahim Badamasi Babangida University, university in Nigeria

• Ibb (Arabic: إب), a city in Yemen

• Ibrahim Badamasi Babangida, former President of Nigeria

• Intentional base on balls, a ploy in baseball
• International Broadcasting Bureau, technical support body for the Voice of America and other US government broadcasting services
• Istanbul Metropolitan Municipality ({{langx|tr|İstanbul Büyükşehir Belediyesi|link=no}}), the governing body of Istanbul
• International Brotherhood of Boilermakers, Iron Ship Builders, Blacksmiths, Forgers and Helpers, a US trade union

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