A great number of valuables Biblical Hebrew manuscripts are conserved in Spanish libraries. They are of various content and some of them are specially significant for many reasons, one of them having been used in the editing of such important Polyglote Bibles like the Complutensian or the Antwerp Bible. A new catalogue describing the Hebrew collections in the different libraries in Madrid has been published. An overview of El Escorial and Complutensian University Libraries was given in Hebrew Studies 2004. Now, the others main libraries collections of manuscripts in Madrid is given, analyzing the most significant manuscripts.Peer reviewed