Maria Chin Abdullah also known as Mary Chin Cheen Lian (born 1956 in United Kingdom) is a current Malaysian activist who held the Bersih rally and form the Coalition for Clean and Fair Elections 2.0 (Bersih 2.0) non-governmental organisation. She voiced for woman rights in Malaysia and become chairwoman of Bersih 2.0 since 2013 and All Women Action Society (AWAM). She is also the executive director of Persatuan Kesedaran Komuniti Selangor (Empower).
On 18 November 2016, the Royal Malaysian Police arrested Maria under the Security Offences, Special Measures Act (SOSMA), which allows the Malaysian police to detain a person for 28 days before filing any charge. The US government has criticised her detention in a permanently-lit isolation confinement cell, saying that the US government is "troubled by the ongoing detention and solitary confinement of Maria Chin Abdullah under national security laws". She was detained the day before massive public protests against the Malaysian federal government head of Najib Razak for widespread corruption allegation involving a US$4 billion state fund scandal.