Judah ben Joseph ibn Ezra (in Hebrew, Yehuda ben Yosef ibn Ezra) was a Jew of Granada, Spain who lived in the twelfth century and rose to favour under Alfonso VII of León and Castile, eventually becoming the king's court chamberlain. Judah, a relative of renowned Granadian poet and philosopher Moses ibn Ezra, was made commander of the fortress at Calatrava by Alfonso after its conquest in 1147. With the permission of Alfonso, Judah also vigorously combated Karaism, which was gaining ground in Castile, and wrote in refutation of its arguments.