Dato' Seri Aminuddin bin Harun (Jawi: أمين الدين بن هارون; born 2 January 1967) is a Malaysian politician who has served as the 11th Menteri Besar of Negeri Sembilan since May 2018 and Member of the Negeri Sembilan State Legislative Assembly (MLA) for Sikamat since March 2008. He is a member of the People's Justice Party (PKR), a component party of the state ruling but federal opposition Pakatan Harapan (PH) coalition. He has served as Vice President of PKR since July 2022 and is also State Chairman of PH and PKR of Negeri Sembilan.