Lilian Decima, Lady Moore-Guggisberg, CBE (11 December 1871 – 18 February 1964), better known by her stage name Decima Moore, was an English singer and actress, known for her performances in soprano roles with the D'Oyly Carte Opera Company and in musical comedies. She was the youngest of ten siblings (hence, the name "Decima"). Her sister, actress Eva Moore, was the mother of actress Jill Esmond, the first wife of Laurence Olivier.