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Fourth Republic (1999–present)
Under the fourth Constitution of the Republic of Nigeria, the president is head of both state and government. The president is elected by for a four-year term. In the event of a vacancy the vice president serves as acting president.

Term of office in years
This is a list of each head of state in order of term length.

Of the 14 post monarchy heads of state, only two, Olusegun Obasanjo and Muhammadu Buhari, served in two non consecutive periods.