This article presents two previously unpublished Old Babylonian tablets on which are inscribed similar bilingual vocabularies. The language in their right-hand columns is Old Babylonian Akkadian. The language in their left-hand columns is mostly North-West Semitic, with some admixture of Akkadian. Editions of the two tablets are accompanied by a commentary which finds parallels for this language in the grammar and vocabulary of other Semitic languages. Evaluation of the results of this enquiry lead to the conclusion that the language of the left-hand columns is a variety of Amorite. The main part of the article concludes with consideration of the two vocabularies’ content, composition and intellectual background. An appendix offers an edition of a Middle Babylonian synonym list related in part to Malku V. It contains a passage on domestic and wild animals which collects mainly North-West Semitic words for domestic and wild animals and probably provides several further items of Amorite vocabulary. Finally we add an index of the words in the Amorite columns of the two Old Babylonian vocabularies.