Mary Mam Yassin Sey, also known as Mary Mamyassin Sey (21 March 1952 – 20 August 2024), was a Gambian judge who previously served as a Justice of the Supreme Court of the Gambia and was also a Judge of the Supreme Court of Vanuatu.
[1] In February 2007, Sey had been appointed to the High Court of Sierra Leone as part of the British Council's Justice Sector Development Programme.
During her time in Sierra Leone, she convicted and sentenced a government minister in a corruption case to five years.
[4] During the case, Sey warned Carcasses against threatening witnesses after one was forced to report his threats to the police.
[8] Sey was appointed a Justice of the Supreme Court of the Gambia in April 2017 by President Adama Barrow.