IBD

• Inflammatory bowel disease, a group of inflammatory conditions of the large and small intestines

• Investment Banking Division, a department of an investment bank
• Independent Bicycle Dealers, a small bicycle business
• Institute of Brewing and Distilling, an international industry trade association

• Identity by descent, alleles that are identical because they descended directly from the same ancestral allele
• Inclusion body disease, a destructive virus occurring in boid snakes
• Infectious bursal disease, a poultry disease causing immunosuppression
• Inverse beta decay, a nuclear reaction commonly used in neutrino detectors
• Iodobenzene dichloride, a reagent used in organic chemistry
• Ion beam deposition

• International Beer Day, an August 5 celebration
• India's Best Dancer, a dance reality show
• Investor's Business Daily, a national newspaper in the United States

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