Tan Sri Dato' Haji Mahiaddin bin Md. Yasin, commonly known as Muhyiddin bin Mohd. Yassin, is a Malaysian politician who served as the 8th Prime Minister of Malaysia from March 2020 to August 2021. Appointed as prime minister amid a political crisis, Muhyiddin served for 17 months and resigned after losing parliamentary support, making him the second shortest-serving prime minister in Malaysian history after Ismail Sabri Yaakob. He is the first prime minister to appoint senior ministers under his administration.