Petronilla Deterville, MBE (14 May 1951-3 October 2010) was a St. Lucian musician and composer recognized for her work in founding youth music and theatrical groups.

She was honored as a member of the Order of the British Empire for her contributions to the development and preservation of St. Lucia's folk music, as well as her efforts to utilize the arts to expand educational opportunities.

[3][4] In 1981, Deterville founded the "Cecilian Reys", a musical group from her home town, which aimed to expand opportunities for youth in the area.

[6] In 1996, she developed the Anse La Raye Youth Orchestra, which had twenty-five musicians composed of strings, winds and drums.

[1] Upon Deterville's death, Gregory Piper took over her work with the Anse La Raye Youth Orchestra, completing her production of Sing de Chorus.