Aminuddin bin Harun (Jawi: ???? ????? ?? ?????; born 2 January 1967) is a Malaysian politician and currently serves as the eleventh Menteri Besar of Negeri Sembilan.
He is also the state assemblyman for Sikamat, Negeri Sembilan, Malaysia.
He is a member of People's Justice Party (PKR), a component party of Pakatan Harapan (PH) coalition.
He is the PH state chief for Negeri Sembilan.Aminuddin has submitted a letter endorsed by PKR chief Wan Azizah Wan Ismail to the Negeri Sembilan Yamtuan Besar as the next Menteri Besar of Negeri Sembilan after PH gained the majority of State Legislative Assembly in the 2018 general election to form the new state government.
He sworn-in as the Menteri Besar of Negeri Sembilan on 12 May 2018 at the Istana Besar Seri Menanti in Kuala Pilah.