As far as I am aware Islam does not have a single spiritual leader, in the same way that Christianity has the Pope. Until the end of the Ottoman Empire (1918) the sultan of the Ottoman Empire was the de facto spiritual leader of Islam.
There is no current Prophet and there is no current leader, called "khalifah" or "deputy"
To be leader over Islam as seen by Shia Muslims, you must be the best religious and political scholar in current time.
Muhammad is said to be the founding leader and prophet of Islam
Prophet Muhammad (peace be upon him) is the original leader of Islam.
The leader of Nation of Islam in 60s-70s was Elijah Muhammad. The current leader is named Louis Farrakhan However, we should know that Nation od Islam (NOI) is quite different bthan the main stream Islam and followers of NOI are not considered to basic principles of Islam and Quran teachings as instructed by prophet Muhammad. Refer to related questions below.
Islam is a religion not a spiritual leader. Islam is not dead.
Islam daily leader is called Imam who leads Muslims on praying for God.
The leader of Islam is prophet Muhammad (peace be upon him) and started in Mecca (or Makkah) in Saudi Arabia.
The original leader of Islam religion per Quran revelation by God is prophet Muhammad (peace be upon him)
Islam
The leader of Islam after prophet Muhammad (peace be upon him) is Abou Bakr Assedique (may God be pleased with him).
this question has vagueness. the shiites as a main sect in Islam believe that the leader of any time is a just , aware and religious man.besides that in the absence of innocent Imam, the guidance and administration of affairs must be in that hand of such jurst. ayyatollah seyyed Ali khamenehei nowdays may god protected him is the current leader of shiite .