Ahmad Samsuri bin Mokhtar, better known as Dr Sam, is a Malaysian politician, aerospace engineer and lecturer who has served as the 15th Menteri Besar of Terengganu, Member of the Terengganu State Legislative Assembly (MLA) for Ru Rendang since May 2018 and the Member of Parliament (MP) for Kemaman since December 2023. He is a member of the Malaysian Islamic Party (PAS), a component party of the Perikatan Nasional (PN) coalition. He has also served as the Vice President of PAS since June 2019.

The Menteri Besar of Terengganu or First Minister of Terengganu is the head of government in the Malaysian state of Terengganu. According to convention, the Menteri Besar is the leader of the majority party or largest coalition party of the Terengganu State Legislative Assembly.