Dato' Raja Kamarul Bahrin Shah bin Raja Ahmad (Jawi: راج قمر البحرين شاه بن راج احمد born 14 January 1955) is a Malaysian politician who served as the Deputy Minister of Housing and Local Government in the Pakatan Harapan (PH) administration under former Prime Minister Mahathir Mohamad and Minister Zuraida Kamaruddin from July 2018 to the collapse of the PH administration in February 2020 and Senator from July 2018 to July 2021. He also served as the Member of Parliament (MP) for Kuala Terengganu from May 2013 to May 2018. He is a member and State Chairman of Terengganu of the National Trust Party (AMANAH) and its coalition PH which is in opposition.