Ghiyasuddin Shah III (reigned: 1563-1564) was the last ruler of Bengal among Mahmud Shahi dynasty.
Beginning in 1562, the Afghan Karrani dynasty began to conquer a vast area within Bengal kingdom. By 1564 Ghiyasuddin Shah III had been assassinated by Taj Khan Karrani, bringing an end to the Muhammad Shahi dynasty. Thus the ruling of Mahmud Shahi dynasty ended and Karrani dynasty was formed.