BIH is a three letter initialism that can stand for:
- Benign intracranial hypertension
- Bihari language, ISO 639 alpha-3 language code
- Bilateral inguinal hernia
- Bosnia and Herzegovina, ISO 3166-1 alpha-3 country code
- Bounding interval hierarchy, a partitioning data structure for computer graphics acceleration
- Bureau International de l'Heure (International Time Bureau)
- Eastern Sierra Regional Airport, IATA location identifier