Sayyid Mir Muhammed Jafar Ali Khan (1691–1765), often known as Mir Jafar, is the second son of Sayyid Ahmad Najafi, and was Nawab (governor) of Bengal, Bihar and Orissa. His full, formal name is "Shuja ul-Mulk, Hashim ud-Daula, Nawab Ja'afar 'Ali Khan Bahadur, Mahabat Jang".