IBT

IBT or ibt may refer to:

* Identity by type, a characteristic of some genetic alleles
* International Bolshevik Tendency, a Trotskyist international organisation
* International Brotherhood of Teamsters, a labor union also known as Teamsters for short
* International Business and Technology Program, also known as IBT
* TOEFL Internet-based Test (TOEFL iBT)
* Aarhus University, Institute of Business and Technology (AU-IBT), Herning, Denmark
* Island Biogeography Theory
* Index Barati Tarsasag, a friendly company, who Call of Duty on-line computer game it is played. His members are all Hungarian.