Johann Albrecht Widmannstetter, also called Widmannstadt, Johannes Albertus Widmanstadius or Widmestadius, (1506 – 28 March 1557) was a German humanist, orientalist, philologist, and theologian.
After 1527, he continued his studies in Italy, in Turin, Naples and Rome, focusing on the languages of Syriac and Arabic.
In the same year, he delivered a series of lectures in Rome, outlining Nicolaus Copernicus' theory to the pope and the cardinals, with which both were impressed.
The rest of Widmanstetter's career was focussed on orientalism, to which he contributed a great deal, collecting hundreds of manuscripts in Hebrew, Arabic and Syriac.
He died in Regensburg, and his personal library was acquired by Albert V, Duke of Bavaria.