Marcia Sherlon Barnwell is a Vincentian lawyer and politician who served in the House of Assembly of Saint Vincent and the Grenadines from 2015 until 2019. A member of the New Democratic Party, she served as an opposition senator, a position appointed by the governor-general.

Prior to entering politics, Barnwell was a barrister with a focus in education, human rights, and community development. She was the recipient of a Chevening Scholarship in 2000 and 2001, and also received a professional certificate in parliamentary governance from McGill University.

Among her actions in parliament, Barnwell questioned Prime Minister Ralph Gonsalves over the "alleged beating of a person in police custody". She left office at the end of her term in January 2019.

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Year of birth missing (living people)
Date of birth missing (living people)
Place of birth missing (living people)
Living people
New Democratic Party (Saint Vincent and the Grenadines) politicians
Members of the House of Assembly of Saint Vincent and the Grenadines
Saint Vincent and the Grenadines women in politics
Saint Vincent and the Grenadines lawyers