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Notes that although the 11th version of the Barratt Impulsiveness Scale (BIS-11) is widely used to measure impulsiveness, an important behavioral trait, there is no Spanish version. The adaptation process included: translation, back-translation, review of both versions and administration of the resulting instrument to a bilingual sample from the target population (n= 29). This process permitted the assessment of the equivalence between the English and Spanish version of the BIS in 3 stages; Linguistic equivalence, Conceptual equivalence and Scale equivalence. Results show that the Linguistic equivalence and Conceptual and Scale equivalence are adequate in this Spanish version of the BIS-11. This adaptation of the BIS-11 is ready to be used on Spanish speaking populations.(PsycINFO Database Record (c) 2017 APA, all rights reserved)