Raja Kamarul Bahrin Shah bin Raja Ahmad Baharuddin Shah (Jawi: راج قمر البحرين شاه بن راج أحمد بحرالدّين شاه 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 former Minister Zuraida Kamaruddin from July 2018 to the collapse of the PH administration in February 2020 and as a Senator from July 2018 to July 2021 as well as the Member of Parliament (MP) for Kuala Terengganu from May 2013 to May 2018.

He was also one of the leader of Angkatan Amanah Merdeka, a defunct Non-Governmental Organisations (NGOs) led by Tengku Razaleigh Hamzah.

He was picked as the party candidate for the Kuala Terengganu federal seat for the 2013 general election on 9 April 2013 and subsequently won.

He then married a Singaporean artist and had four children, Badruddin Hakim, Bahiuddin Ansari, Aryani Munirah and Salihah Nazirah.

He signed over custody of their two children, Shahirah Bahrin and Mohammed Baharuddin, an arrangement which was later ratified by the Family Court of Australia.

His company, Senibahri Arkitek, designed the Sultan Mizan Zainal Abidin Stadium in Terengganu, which collapsed twice: first in 2009,[5] then again in 2013.