Kamal al-Deen Maitham bin Ali bin Maitham al-Bahrani (Arabic: الشيخ ميثم البحراني‎, 1238 – 1299), commonly known as Sheikh Maitham Al Bahrani (also spelt Maytham al-Bahrani) was a leading 13th Century Twelver Eastern Arabian theologian, author and philosopher. Al Bahrani wrote on Twelver doctrine, affirmed free will, the infallibility of prophets and imams, the appointed imamate of `Ali, and the occultation of the Twelfth Imam.