Longest-serving leaders of all time

The leaders who held power longest across 193 countries, ranked by total days in office across all their terms. Monarchs are included where the monarch is the head of state.

See also: shortest-serving leaders and tenure by political system

All time — top 10

#	Leader	Country	In office	Days
1	Johann II, Prince of Liechtenstein	🇱🇮 Liechtenstein	1858–1929	25,932
2	Hassanal Bolkiah I of BruneiIn office	🇧🇳 Brunei	1967–now	21,562
3	Isa I of Bahrain	🇧🇭 Bahrain	1869–1923	19,533
4	Leopold II of Belgium	🇧🇪 Belgium	1865–1909	16,070
5	Paul BiyaIn office	🇨🇲 Cameroon	1982–now	16,051
6	Baudouin I of Belgium	🇧🇪 Belgium	1951–1993	15,355
7	Elizabeth II	🇦🇬 Antigua and Barbuda	1981–2022	14,921
8	José Eduardo dos Santos	🇦🇴 Angola	1979–2017	13,885
9	Isa II of Bahrain	🇧🇭 Bahrain	1961–1999	13,594
10	Jigme Singye Wangchuck	🇧🇹 Bhutan	1972–2006	12,564

Modern history — top 10 (since 1826)

Restricted to leaders who took office in the last 200 years, so ancient reigns with patchy records do not dominate the list.

#	Leader	Country	In office	Days
1	Johann II, Prince of Liechtenstein	🇱🇮 Liechtenstein	1858–1929	25,932
2	Hassanal Bolkiah I of BruneiIn office	🇧🇳 Brunei	1967–now	21,562
3	Isa I of Bahrain	🇧🇭 Bahrain	1869–1923	19,533
4	Leopold II of Belgium	🇧🇪 Belgium	1865–1909	16,070
5	Paul BiyaIn office	🇨🇲 Cameroon	1982–now	16,051
6	Baudouin I of Belgium	🇧🇪 Belgium	1951–1993	15,355
7	Elizabeth II	🇦🇬 Antigua and Barbuda	1981–2022	14,921
8	José Eduardo dos Santos	🇦🇴 Angola	1979–2017	13,885
9	Isa II of Bahrain	🇧🇭 Bahrain	1961–1999	13,594
10	Jigme Singye Wangchuck	🇧🇹 Bhutan	1972–2006	12,564

See the full top 100 →