<Table> <Tr> <Th> Rank </Th> <Th> Image </Th> <Th> Name </Th> <Th> Country </Th> <Th> Office </Th> <Th> Tenure began </Th> <Th> Length of tenure </Th> </Tr> <Tr> <Td> 1 . </Td> <Td> </Td> <Td> Paul Biya </Td> <Td> Cameroon </Td> <Td> Prime Minister, then President </Td> <Td> 30 June 1975 </Td> <Td> 7004154800000000000 ♠ 42 years, 139 days </Td> </Tr> <Tr> <Td> 2 . </Td> <Td> </Td> <Td> Teodoro Obiang Nguema Mbasogo </Td> <Td> Equatorial Guinea </Td> <Td> President </Td> <Td> 3 August 1979 </Td> <Td> 7004139850000000000 ♠ 38 years, 105 days </Td> </Tr> <Tr> <Td> 3 . </Td> <Td> </Td> <Td> Robert Mugabe </Td> <Td> Zimbabwe </Td> <Td> Prime Minister, then President </Td> <Td> 18 April 1980 </Td> <Td> 7004137260000000000 ♠ 37 years, 212 days </Td> </Tr> <Tr> <Td> 4 . </Td> <Td> </Td> <Td> Ali Khamenei </Td> <Td> Iran </Td> <Td> President, then Supreme Leader </Td> <Td> 13 October 1981 </Td> <Td> 7004131830000000000 ♠ 36 years, 34 days </Td> </Tr> <Tr> <Td> 5 . </Td> <Td> </Td> <Td> Nursultan Nazarbayev </Td> <Td> Kazakhstan </Td> <Td> Prime Minister, then First Secretary, then President </Td> <Td> 22 March 1984 </Td> <Td> 7004122920000000000 ♠ 33 years, 239 days </Td> </Tr> <Tr> <Td> 6 . </Td> <Td> </Td> <Td> Denis Sassou Nguesso </Td> <Td> Republic of the Congo </Td> <Td> President </Td> <Td> 8 February 1979--31 August 1992 (1st time) 25 October 1997--present (2nd time) </Td> <Td> 7004122800000000000 ♠ 33 years, 227 days </Td> </Tr> <Tr> <Td> 7 . </Td> <Td> </Td> <Td> Hun Sen </Td> <Td> Cambodia </Td> <Td> Prime Minister </Td> <Td> 14 January 1985 </Td> <Td> 7004119940000000000 ♠ 32 years, 306 days </Td> </Tr> <Tr> <Td> 8 . </Td> <Td> </Td> <Td> Yoweri Museveni </Td> <Td> Uganda </Td> <Td> President </Td> <Td> 26 January 1986 </Td> <Td> 7004116170000000000 ♠ 31 years, 294 days </Td> </Tr> <Tr> <Td> 9 . </Td> <Td> </Td> <Td> Omar al - Bashir </Td> <Td> Sudan </Td> <Td> President </Td> <Td> 30 June 1989 </Td> <Td> 7004103660000000000 ♠ 28 years, 139 days </Td> </Tr> <Tr> <Td> 10 . </Td> <Td> </Td> <Td> Idriss Déby </Td> <Td> Chad </Td> <Td> President </Td> <Td> 2 December 1990 </Td> <Td> 7003984600000000000 ♠ 26 years, 349 days </Td> </Tr> <Tr> <Td> 11 . </Td> <Td> </Td> <Td> Isaias Afwerki </Td> <Td> Eritrea </Td> <Td> President </Td> <Td> 27 April 1991 </Td> <Td> 7003970000000000000 ♠ 26 years, 203 days </Td> </Tr> <Tr> <Td> 12 . </Td> <Td> </Td> <Td> Emomali Rahmon </Td> <Td> Tajikistan </Td> <Td> Acting Head of State, then President </Td> <Td> 19 November 1992 </Td> <Td> 7003912800000000000 ♠ 24 years, 362 days </Td> </Tr> <Tr> <Td> 13 . </Td> <Td> </Td> <Td> Paul Kagame </Td> <Td> Rwanda </Td> <Td> Vice-President, then President </Td> <Td> 19 July 1994 </Td> <Td> 7003852100000000000 ♠ 23 years, 120 days </Td> </Tr> <Tr> <Td> 14 . </Td> <Td> </Td> <Td> Alexander Lukashenko </Td> <Td> Belarus </Td> <Td> President </Td> <Td> 20 July 1994 </Td> <Td> 7003852000000000000 ♠ 23 years, 119 days </Td> </Tr> <Tr> <Td> 15 . </Td> <Td> </Td> <Td> Artur Rasizade </Td> <Td> Azerbaijan </Td> <Td> Prime Minister </Td> <Td> 20 July 1996--4 August 2003 (1st time) 6 August 2003--present (2nd time) </Td> <Td> 7003778700000000000 ♠ 21 years, 117 days </Td> </Tr> <Tr> <Td> 16 . </Td> <Td> </Td> <Td> Daniel Ortega </Td> <Td> Nicaragua </Td> <Td> Acting Head of State, then President </Td> <Td> 4 March 1981--25 April 1990 (1st time) 10 January 2007--present (2nd time) </Td> <Td> 7003730200000000000 ♠ 19 years, 362 days </Td> </Tr> <Tr> <Td> 17 . </Td> <Td> </Td> <Td> Kim Yong - nam </Td> <Td> North Korea </Td> <Td> President of the Presidium of the Supreme People's Assembly </Td> <Td> 5 September 1998 </Td> <Td> 7003701200000000000 ♠ 19 years, 72 days </Td> </Tr> <Tr> <Td> 18 . </Td> <Td> </Td> <Td> Tuilaepa Aiono Sailele Malielegaoi </Td> <Td> Samoa </Td> <Td> Prime Minister </Td> <Td> 23 November 1998 </Td> <Td> 7003693300000000000 ♠ 18 years, 358 days </Td> </Tr> <Tr> <Td> 19 . </Td> <Td> </Td> <Td> Abdelaziz Bouteflika </Td> <Td> Algeria </Td> <Td> President </Td> <Td> 27 April 1999 </Td> <Td> 7003677800000000000 ♠ 18 years, 203 days </Td> </Tr> <Tr> <Td> 20 . </Td> <Td> </Td> <Td> Ismaïl Omar Guelleh </Td> <Td> Djibouti </Td> <Td> President </Td> <Td> 8 May 1999 </Td> <Td> 7003676700000000000 ♠ 18 years, 192 days </Td> </Tr> <Tr> <Td> 21 . </Td> <Td> </Td> <Td> Vladimir Putin </Td> <Td> Russia </Td> <Td> Prime Minister, then President </Td> <Td> 9 August 1999 </Td> <Td> 7003667400000000000 ♠ 18 years, 99 days </Td> </Tr> <Tr> <Td> 22 . </Td> <Td> </Td> <Td> Keith Mitchell </Td> <Td> Grenada </Td> <Td> Prime Minister </Td> <Td> 22 June 1995--9 July 2008 (1st time) 20 February 2013--present (2nd time) </Td> <Td> 7003649600000000000 ♠ 17 years, 286 days </Td> </Tr> <Tr> <Td> 23 . </Td> <Td> </Td> <Td> Hage Geingob </Td> <Td> Namibia </Td> <Td> Prime Minister, then President </Td> <Td> 21 March 1990--28 August 2002 (1st time) 4 December 2012--present (2nd time) </Td> <Td> 7003635100000000000 ♠ 17 years, 142 days </Td> </Tr> <Tr> <Td> 24 . </Td> <Td> </Td> <Td> Bashar al - Assad </Td> <Td> Syria </Td> <Td> President </Td> <Td> 17 July 2000 </Td> <Td> 7003633100000000000 ♠ 17 years, 122 days </Td> </Tr> <Tr> <Td> 25 . </Td> <Td> </Td> <Td> Joseph Kabila </Td> <Td> Democratic Republic of the Congo </Td> <Td> President </Td> <Td> 17 January 2001 </Td> <Td> 7003614700000000000 ♠ 16 years, 303 days </Td> </Tr> <Tr> <Td> 26 . </Td> <Td> </Td> <Td> Ralph Gonsalves </Td> <Td> Saint Vincent and the Grenadines </Td> <Td> Prime Minister </Td> <Td> 29 March 2001 </Td> <Td> 7003607600000000000 ♠ 16 years, 232 days </Td> </Tr> <Tr> <Td> 27 . </Td> <Td> </Td> <Td> Barnabas Sibusiso Dlamini </Td> <Td> Swaziland </Td> <Td> Prime Minister </Td> <Td> 26 July 1996--29 September 2003 (1st time) 23 October 2008--present (2nd time) </Td> <Td> 7003593200000000000 ♠ 16 years, 88 days </Td> </Tr> <Tr> <Td> 28 . </Td> <Td> </Td> <Td> Dési Bouterse </Td> <Td> Suriname </Td> <Td> De Facto Head of State, then President </Td> <Td> 25 February 1980--25 January 1988 (1st time) 12 August 2010--present (2nd time) </Td> <Td> 7003554400000000000 ♠ 15 years, 65 days </Td> </Tr> <Tr> <Td> 29 . </Td> <Td> </Td> <Td> Recep Tayyip Erdoğan </Td> <Td> Turkey </Td> <Td> Prime Minister, then President </Td> <Td> 14 March 2003 </Td> <Td> 7003536100000000000 ♠ 14 years, 247 days </Td> </Tr> <Tr> <Td> 30 . </Td> <Td> </Td> <Td> Filip Vujanović </Td> <Td> Montenegro </Td> <Td> President </Td> <Td> 22 May 2003 </Td> <Td> 7003529200000000000 ♠ 14 years, 178 days </Td> </Tr> <Tr> <Td> 31 . </Td> <Td> </Td> <Td> Ilham Aliyev </Td> <Td> Azerbaijan </Td> <Td> Prime Minister, then President </Td> <Td> 4 August 2003 </Td> <Td> 7003521800000000000 ♠ 14 years, 104 days </Td> </Tr> <Tr> <Td> 32 . </Td> <Td> </Td> <Td> Abdelkader Taleb Omar </Td> <Td> Sahrawi Arab Democratic Republic </Td> <Td> Prime Minister </Td> <Td> 29 October 2003 </Td> <Td> 7003513200000000000 ♠ 14 years, 18 days </Td> </Tr> <Tr> <Td> 33 . </Td> <Td> </Td> <Td> Shavkat Mirziyoyev </Td> <Td> Uzbekistan </Td> <Td> Prime Minister, then President </Td> <Td> 12 December 2003 </Td> <Td> 7003508800000000000 ♠ 13 years, 339 days </Td> </Tr> <Tr> <Td> 34 . </Td> <Td> </Td> <Td> Sheikh Hasina </Td> <Td> Bangladesh </Td> <Td> Prime Minister </Td> <Td> 23 June 1996--15 July 2001 (1st time) 6 January 2009--present (2nd time) </Td> <Td> 7003508500000000000 ♠ 13 years, 336 days </Td> </Tr> <Tr> <Td> 35 . </Td> <Td> </Td> <Td> Roosevelt Skerrit </Td> <Td> Dominica </Td> <Td> Prime Minister </Td> <Td> 8 January 2004 </Td> <Td> 7003506100000000000 ♠ 13 years, 312 days </Td> </Tr> <Tr> <Td> 36 . </Td> <Td> </Td> <Td> Mahmoud Abbas </Td> <Td> Palestine </Td> <Td> Prime Minister, then President </Td> <Td> 19 March 2003--6 September 2003 (1st time) 15 January 2005--present (2nd time) </Td> <Td> 7003485900000000000 ♠ 13 years, 111 days </Td> </Tr> <Tr> <Td> 37 . </Td> <Td> </Td> <Td> Lee Hsien Loong </Td> <Td> Singapore </Td> <Td> Prime Minister </Td> <Td> 12 August 2004 </Td> <Td> 7003484400000000000 ♠ 13 years, 96 days </Td> </Tr> <Tr> <Td> 38 . </Td> <Td> </Td> <Td> Tommy Remengesau </Td> <Td> Palau </Td> <Td> President </Td> <Td> 1 January 2001--15 January 2009 (1st time) 17 January 2013--present (2nd time) </Td> <Td> 7003470000000000000 ♠ 12 years, 317 days </Td> </Tr> <Tr> <Td> 39 . </Td> <Td> </Td> <Td> Faure Gnassingbé </Td> <Td> Togo </Td> <Td> President </Td> <Td> 5 February 2005--25 February 2005 (1st time) 4 May 2005--present (2nd time) </Td> <Td> 7003459900000000000 ♠ 12 years, 216 days </Td> </Tr> <Tr> <Td> 40 . </Td> <Td> </Td> <Td> Salva Kiir Mayardit </Td> <Td> South Sudan </Td> <Td> President </Td> <Td> 30 July 2005 </Td> <Td> 7003449200000000000 ♠ 12 years, 109 days </Td> </Tr> <Tr> <Td> 41 . </Td> <Td> </Td> <Td> Pierre Nkurunziza </Td> <Td> Burundi </Td> <Td> President </Td> <Td> 26 August 2005 </Td> <Td> 7003446500000000000 ♠ 12 years, 82 days </Td> </Tr> <Tr> <Td> 42 . </Td> <Td> </Td> <Td> Angela Merkel </Td> <Td> Germany </Td> <Td> Federal Chancellor </Td> <Td> 22 November 2005 </Td> <Td> 7003437700000000000 ♠ 11 years, 359 days </Td> </Tr> <Tr> <Td> 43 . </Td> <Td> </Td> <Td> Ellen Johnson Sirleaf </Td> <Td> Liberia </Td> <Td> President </Td> <Td> 16 January 2006 </Td> <Td> 7003432200000000000 ♠ 11 years, 304 days </Td> </Tr> <Tr> <Td> 44 . </Td> <Td> </Td> <Td> Evo Morales </Td> <Td> Bolivia </Td> <Td> President </Td> <Td> 22 January 2006 </Td> <Td> 7003431600000000000 ♠ 11 years, 298 days </Td> </Tr> <Tr> <Td> 45 . </Td> <Td> </Td> <Td> Benjamin Netanyahu </Td> <Td> Israel </Td> <Td> Prime Minister </Td> <Td> 18 June 1996--6 July 1999 (1st time) 31 March 2009--present (2nd time) </Td> <Td> 7003426500000000000 ♠ 11 years, 247 days </Td> </Tr> <Tr> <Td> 46 . </Td> <Td> </Td> <Td> Viktor Orbán </Td> <Td> Hungary </Td> <Td> Prime Minister </Td> <Td> 6 July 1998--27 May 2002 (1st time) 29 May 2010--present (2nd time) </Td> <Td> 7003414900000000000 ♠ 11 years, 131 days </Td> </Tr> <Tr> <Td> 47 . </Td> <Td> </Td> <Td> Raúl Castro </Td> <Td> Cuba </Td> <Td> First Secretary, President and Prime Minister </Td> <Td> 31 July 2006 </Td> <Td> 7003412600000000000 ♠ 11 years, 108 days </Td> </Tr> <Tr> <Td> 48 . </Td> <Td> </Td> <Td> Doris Leuthard </Td> <Td> Switzerland </Td> <Td> Federal Council Member, currently President </Td> <Td> 1 August 2006 </Td> <Td> 7003412500000000000 ♠ 11 years, 107 days </Td> </Tr> <Tr> <Td> 49 . </Td> <Td> </Td> <Td> Frank Bainimarama </Td> <Td> Fiji </Td> <Td> Acting Head of State, then Prime Minister </Td> <Td> 29 May 2000--13 July 2000 (1st time) 5 December 2006--present (2nd time) </Td> <Td> 7003404400000000000 ♠ 11 years, 26 days </Td> </Tr> <Tr> <Td> 50 . </Td> <Td> </Td> <Td> Gurbanguly Berdimuhamedow </Td> <Td> Turkmenistan </Td> <Td> President </Td> <Td> 21 December 2006 </Td> <Td> 7003398300000000000 ♠ 10 years, 330 days </Td> </Tr> <Tr> <Td> 51 . </Td> <Td> </Td> <Td> Serzh Sargsyan </Td> <Td> Armenia </Td> <Td> Prime Minister, then President </Td> <Td> 25 March 2007 </Td> <Td> 7003388900000000000 ♠ 10 years, 236 days </Td> </Tr> <Tr> <Td> 52 . </Td> <Td> </Td> <Td> Ahmed Ouyahia </Td> <Td> Algeria </Td> <Td> Prime Minister </Td> <Td> 31 December 1995--15 December 1998 (1st time) 5 May 2003--24 May 2006 (2nd time) 23 June 2008--3 September 2012 (3rd time) 16 August 2017--present (4th time) </Td> <Td> 7003382000000000000 ♠ 10 years, 167 days </Td> </Tr> <Tr> <Td> 53 . </Td> <Td> </Td> <Td> Ibrahim Boubacar Keïta </Td> <Td> Mali </Td> <Td> Prime Minister, then President </Td> <Td> 4 February 1994--15 February 2000 (1st time) 4 September 2013--present (2nd time) </Td> <Td> 7003373700000000000 ♠ 10 years, 84 days </Td> </Tr> <Tr> <Td> 54 . </Td> <Td> </Td> <Td> Bako Sahakyan </Td> <Td> Artsakh </Td> <Td> President </Td> <Td> 7 September 2007 </Td> <Td> 7003372300000000000 ♠ 10 years, 70 days </Td> </Tr> <Tr> <Td> 55 . </Td> <Td> </Td> <Td> Ernest Bai Koroma </Td> <Td> Sierra Leone </Td> <Td> President </Td> <Td> 17 September 2007 </Td> <Td> 7003371300000000000 ♠ 10 years, 60 days </Td> </Tr> <Tr> <Td> 56 . </Td> <Td> </Td> <Td> Alassane Ouattara </Td> <Td> Côte d'Ivoire </Td> <Td> Prime Minister, then President </Td> <Td> 7 November 1990--9 December 1993 (1st time) 4 December 2010--present (2nd time) </Td> <Td> 7003366700000000000 ♠ 10 years, 14 days </Td> </Tr> </Table> <Tr> <Th> Rank </Th> <Th> Image </Th> <Th> Name </Th> <Th> Country </Th> <Th> Office </Th> <Th> Tenure began </Th> <Th> Length of tenure </Th> </Tr> <Tr> <Td> 1 . </Td> <Td> </Td> <Td> Paul Biya </Td> <Td> Cameroon </Td> <Td> Prime Minister, then President </Td> <Td> 30 June 1975 </Td> <Td> 7004154800000000000 ♠ 42 years, 139 days </Td> </Tr> <Tr> <Td> 2 . </Td> <Td> </Td> <Td> Teodoro Obiang Nguema Mbasogo </Td> <Td> Equatorial Guinea </Td> <Td> President </Td> <Td> 3 August 1979 </Td> <Td> 7004139850000000000 ♠ 38 years, 105 days </Td> </Tr>

Who has been the chief minister for longest time