Islamic religious leaders have traditionally been people who, as part of the clerisy, mosque, or government, performed a prominent role within their community or nation. However, in the modern contexts of Muslims minorities in non-Muslim countries as well as secularised Muslim states like Turkey, Indonesia and Bangladesh, religious leadership may take a variety of non-formal shapes.
Allamah is an honorary and prestigious title carried by only the very highest scholars of Islamic thought, jurisprudence, and philosophy. It is used as an honorific in Sunni Islam as well as in Shia Islam.
"Almami" is a title of West African Muslim rulers, used especially in the conquest states of the 19th century.
Caliph was first used for Abu Bakr, who was elected head of the Muslim community after Muhammad's death.
Imam is an Arabic word meaning "Leader". The ruler of a country might be called the Imam, for example. The term, however, has important connotations in the Islamic tradition especially in Shia Beliefs . In Sunni belief, the term is used for the founding scholars of the four Sunni madhhabs, or schools of religious jurisprudence (fiqh).