John of Sicily

John of Sicily was an astronomer active in Paris in the late 13th century. His only known surviving work is , a Latin commentary on the instructional material, , attached to the Toledan Tables. It was a popular work on trigonometry and planetary motion. It survives in ten complete manuscript copies and some further fragments. It was completed at Paris between 1291 and 1293 based in part on an earlier anonymous commentary. John also had access to the astronomical tables of Ibn Isḥāq al-Tūnisī.

A lost work by John may be referenced in the inventory made of the library of King Charles V of France shortly after his death in 1380. A copy of John's commentary is listed and under the same name an Almagest, probably a work on planetary theory completed after the commentary.