Marcia Llyneth Griffiths OJ OD (born 23 November 1949) is a Jamaican singer. One reviewer described her by noting “she is known primarily for her strong, smooth-as-mousse love songs and captivating live performances”.

Born in West Kingston, Jamaica, Griffiths started her career in 1964, performing on stage with Byron Lee and the Dragonaires at the behest of Phillip James of The Blues Busters, who had heard her singing in her home neighbourhood. Her performance was sufficiently impressive that the following day Ronnie Nasralla and Clement Dodd both offered her recording contracts. She chose to record for Dodd’s Studio One label, where she recorded a series of duets with male singers such as Tony Gregory (“You’re Mine”), Bob Marley (“Oh My Darling”), Jeff Dixon (“Words”), and Bob Andy (“Always Together”), with whom she would have a relationship lasting several years. In 1968 she had her first success as a solo artist, with “Feel Like Jumping”, which like her other early Studio One solo hits (including “Truly” and “Melody Life”), were written by Andy.