Abū al‐Ṣalt, Umayya ibn ʿAbd al‐ʿAzīz ibn Abī al‐Ṣalt al‐Dānī al‐Andalusī (c. 1068 – 23 October 1134) was an Andalusian polymath whose works on astronomical instruments were read both in the Islamic world and Europe. He also worked as a physician, a teacher of alchemy, and wrote treatises on medicine, philosophy, music, and history. He became well known in Europe through translations of his works made in the Iberian Peninsula and in southern France.