A caliphate (Arabic: خِلافة‎ khilāfa) is an area containing an Islamic steward known as a caliph (Arabic: خَليفة‎ khalīfah  pronunciation )—a person considered a religious successor to the Islamic prophet, Muhammad (Muhammad ibn ʿAbdullāh), and a leader of the entire Muslim community. The Rashidun caliphs, who directly succeeded Muhammad as leaders of the Muslim community, were chosen through shura, a process of community consultation that some consider loosely to be an early form of Islamic democracy. During the history of Islam after the Rashidun period, many Muslim states, almost all of them hereditary monarchies, have claimed to be caliphates. Even though Caliphates were thought to go back to Muhammad, they were not thought of as having the same prophetic power as he did.

The Sunni branch of Islam stipulates that, as a head of state, a Caliph should be elected by Muslims or their representatives. Followers of Shia Islam, however, believe a Caliph should be an Imam chosen by God from the Ahl al-Bayt (the "Family of the House", Muhammad's direct descendants).