Table showing the 18 longest-serving world leaders currently in power along with the country they lead, their position, and number of years in power. The longest-serving world leader is President Obiang of Equatorial Guinea, who has been in power for 43 years. The world leader in the table who has been in power for the shortest amount of time is President Erdoğan of Turkey, who has been in power for 20 years. Leaders are color-coded by their role. Twelve are in president roles, four are monarchs, one is a religious leader and the other is a prime minster.