Ahmad Mustain bin Othman is a Malaysian politician who served as Member of the Selangor State Legislative Assembly (MLA) for Sabak from May 2018 to August 2023. He is a member of the People's Justice Party (PKR) and was a member of the National Trust Party (AMANAH), both are component parties of the Pakatan Harapan (PH) coalition. He was removed from AMANAH in July 2020 and he joined PKR in February 2021.

Ahmad Mustain Othman was elected as Branch Chief of Sabak Bernam of the People's Justice Party in 2025.

Election results + Selangor State Legislative Assembly Percentage figures based on total turnout. Percentage figures based on total turnout.YearConstituencyCandidateVotesPctOpponent(s)VotesPctBallots castMajorityTurnout2018N02 SabakAhmad Mustain Othman (AMANAH)6,98134.88%Sallehudin Mohd Iskan (UMNO)6,85134.23%20,417 13083.03%Sallehen Mukhyi (PAS)6,18330.89%

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