Who was the first caliph after the death of Prophet Muhammad (PBUH) ? A Abu Bakr as-Siddiq (R.A) B Umar ibn al-Khattab (R.A) C Ali ibn Abi Talib (R.A) D Uthman ibn Affan (R.A) Submit Answer Related Islamic questions Which Prophet is considered the father of the Arab people through his son Ishmael A.S.? What is the significance of the "Hijra" in the Islamic calendar? Who is the first martyr in Islam? Which battle in Islamic history is known as the "Battle of the Trench"? Who was the second Caliph of Islam after Abu Bakr as-Siddiq (R.A) ? Back to All Questions