Datuk Seri Salahuddin bin Ayub (Jawi: صلاح الدين بن أيوب; born 1 December 1961) is a Malaysian politician who has served as the Minister of Domestic Trade and Living Costs in the Pakatan Harapan (PH) administration under Prime Minister Anwar Ibrahim since December 2022 and Minister of Agriculture and Agro-based Industry in the PH administration under former Prime Minister Mahathir Mohamad from May 2018 to his resignation and the collapse of the PH administration in February 2020. He has also served as the Member of Parliament (MP) for the Pulai since May 2018, Kubang Kerian from March 2004 to May 2013 and Member of the Johor State Legislative Assembly (MLA) for Simpang Jeram since May 2018. He is a member of the National Trust Party (AMANAH), a component party of PH opposition coalition.