IIB may refer to:
- IIb, a diamond type
- IIb, a type of type II supernova
- International Investment Bank, a multilateral development bank
- "Ice Ice Baby", a hip hop song written by American rapper Vanilla Ice
- International Patent Institute (Institut International des Brevets), an intellectual property organisation established on June 6, 1947, now defunct
- Islamic International Brigade, an international unit of Islamist mujahideen founded in 1998
- KBC Bank Ireland, (established in 1973 as Irish Intercontinental Bank), one of the leading non-retail banks in Ireland
- Type II string theory (type IIB), described by type IIB supergravity in ten dimensions
- IBM Integration Bus, an Enterprise Service Bus software product by IBM
- 2B (disambiguation), including a list of topics named II-B, etc.
disambiguation page lists articles associated with the title IIB.
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