This chapter offers an overview of the languages with which Spanish has entered into contact in the course of its history. As is to be expected, most contact-induced changes in standard Spanish are found in the lexicon, although some derivational suffixes of foreign origin have also become productive. Spanish also underwent a few contact-induced morphosyntactic changes. Spanish’s sister-languages in the Romance family (including French, Catalan, Portuguese, and Italian), and their shared ancestor Latin, are by some stretch the biggest donors, although English, Basque, Celtic, Germanic and especially Arabic are also notable donors, and some of these loans have replaced previously inherited items of Latin origin.