Mohamed Ould Abdel Aziz (Arabic: محمد ولد عبد العزيز, romanized: Muḥammad Wald 'Abd al-'Azīz; born 20 December 1956) is a retired Mauritanian military officer and politician who served as the 8th President of Mauritania from 2009 to 2019.
A career soldier and high-ranking officer, he was a leading figure in the August 2005 coup that ousted President Maaouya Ould Sid'Ahmed Taya, and later in August 2008, he led another coup, that removed President Sidi Ould Cheikh Abdallahi. After the 2008 coup, Mohamed became president of the High Council of State as part of what was described as a political transition leading to a new election. He resigned from that post in April 2009 in order to stand as a candidate in the July 2009 presidential election, which he won. He took office in August 2009. He was subsequently re-elected in 2014, then did not seek re-election in 2019. He was succeeded by Mohamed Ould Ghazouani, who assumed office in August 2019.