Abdullah al-Qasemi (1907 – 9 January 1996; Arabic: عبدالله القصيمي) was a Saudi Arabian 20th-century writer and intellectual. He was one of the most controversial intellectuals in the Arab world because of his radical change from defending Salafism to defending atheism and rejecting organized religion. He questioned the existence of God and criticized religions, which resulted in the allegations of him becoming an atheist, therefore his books were banned all over the Arab world.