| 1 | A | B | C | D | E | F | G | H | I |
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| 2 | List of Prime Ministers of Mauritania - List |  |  |  |  |  |  |  |  |
| 3 | No. | Prime Minister (Birth–Death) | Portrait | Tenure | Tenure | Tenure | Political affiliation | Political affiliation | Head(s) of State |
| 4 | No. | Prime Minister (Birth–Death) | Portrait | Took office | Left office | Time in office | Political affiliation | Political affiliation | Head(s) of State |
| 5 | 1 | Moktar Ould Daddah (1924–2003) | - | 28 November 1960 | 20 August 1961 | 265 days | - | PRM / PPM | Himself |
| 6 | Post abolished (20 August 1961 – 6 April 1979) | Post abolished (20 August 1961 – 6 April 1979) | Post abolished (20 August 1961 – 6 April 1979) | Post abolished (20 August 1961 – 6 April 1979) | Post abolished (20 August 1961 – 6 April 1979) | Post abolished (20 August 1961 – 6 April 1979) | Post abolished (20 August 1961 – 6 April 1979) | Post abolished (20 August 1961 – 6 April 1979) | Post abolished (20 August 1961 – 6 April 1979) |
| 7 | 2 | Ahmed Ould Bouceif (1934–1979) | - | 6 April 1979 | 27 May 1979 (died in office.) | 51 days | - | Military | Salek |
| 8 | – | Ahmed Salim Ould Sidi (1939–1981) | - | 28 May 1979 | 31 May 1979 | 3 days | - | Military | Salek |
| 9 | 3 | Mohamed Khouna Ould Haidalla (1940–) | - | 31 May 1979 | 12 December 1980 | 1 year, 195 days | - | Military | Salek Louly Himself |
| 10 | 4 | Sid Ahmed Ould Bneijara (1947–2017) | - | 12 December 1980 | 25 April 1981 | 134 days | - | Independent | Haidalla |
| 11 | 5 | Maaouya Ould Sid'Ahmed Taya (1941–) | - | 25 April 1981 | 8 March 1984 | 2 years, 318 days | - | Military | Haidalla |
| 12 | (3) | Mohamed Khouna Ould Haidalla (1940–) | - | 8 March 1984 | 12 December 1984 (deposed.) | 279 days | - | Military | Himself |
| 13 | (5) | Maaouya Ould Sid'Ahmed Taya (1941–) | - | 12 December 1984 | 18 April 1992 | 7 years, 128 days | - | Military | Himself |
| 14 | 6 | Sidi Mohamed Ould Boubacar (1957–) | - | 18 April 1992 | 2 January 1996 | 3 years, 259 days | - | PRDS | Taya |
| 15 | 7 | Cheikh El Avia Ould Mohamed Khouna (1956–) | - | 2 January 1996 | 18 December 1997 | 1 year, 350 days | - | PRDS | Taya |
| 16 | 8 | Mohamed Lemine Ould Guig (1959–) | - | 18 December 1997 | 16 November 1998 | 333 days | - | PRDS | Taya |
| 17 | (7) | Cheikh El Avia Ould Mohamed Khouna (1956–) | - | 16 November 1998 | 6 July 2003 | 4 years, 232 days | - | PRDS | Taya |
| 18 | 9 | Sghair Ould M'Bareck (1954–) | - | 6 July 2003 | 7 August 2005 (deposed.) | 2 years, 32 days | - | PRDS | Taya |
| 19 | (6) | Sidi Mohamed Ould Boubacar (1957–) | - | 7 August 2005 | 20 April 2007 | 1 year, 256 days | - | PRDS | Vall |
| 20 | 10 | Zeine Ould Zeidane (1966–) | - | 20 April 2007 | 6 May 2008 | 1 year, 16 days | - | Independent | Abdallahi |
| 21 | 11 | Yahya Ould Ahmed El Waghef (1960–) | - | 6 May 2008 | 6 August 2008 (deposed.) | 92 days | - | ADIL | Abdallahi |
| 22 | Vacant (6 – 14 August 2008) | Vacant (6 – 14 August 2008) | Vacant (6 – 14 August 2008) | Vacant (6 – 14 August 2008) | Vacant (6 – 14 August 2008) | Vacant (6 – 14 August 2008) | Vacant (6 – 14 August 2008) | Vacant (6 – 14 August 2008) | Vacant (6 – 14 August 2008) |
| 23 | 12 | Moulaye Ould Mohamed Laghdaf (1957–) | - | 14 August 2008 | 20 August 2014 | 6 years, 6 days | - | Independent | Aziz Mbaré |
| 24 | 13 | Yahya Ould Hademine (1953–) | - | 20 August 2014 | 29 October 2018 | 4 years, 70 days | - | Independent | Aziz |
| 25 | 14 | Mohamed Salem Ould Béchir (1962–) | - | 29 October 2018 | Incumbent | 141 days | - | UPR | Aziz |

Question: During which years was Sidi Mohamed Ould Boubacar (born 1957) prime minister of Mauritania?
Answer: Sidi Mohamed Ould Boubacar (born 1957) was prime minister of Mauritania from 1992 to 1996 and again from 2005 to 2007.