Gladys Lillian Moncrieff OBE (13 April 1892 – 8 February 1976) was an Australian singer who was so successful in musical theatre and recordings that she became known as 'Australia's Queen of Song' and 'Our Glad'.

Her father Robert Edward Moncrieff was a piano tuner, and her mother, who went by the stage name Amy Lambell, was a professional singer; they lived in North Isis.

Her first stage performance was at the age of six at the Queen's Theatre in Bundaberg, where she sang the American folk song "The Merriest Girl That's Out" with her father accompanying on piano.

At the 1907 Charters Towers eisteddfod, Gladys shared first prize for her junior soprano rendition of "O for the Wings of a Dove" with local girl Eileen Coleman.

Moncrieff was billed as 'Little Gladys: The Australian Wonder Child'[2] and her performances helped her to raise funds to move to Brisbane to pursue her career.

She was successful, and with a starting salary of £3 per week she spent 18 months receiving singing lessons from Ward's wife, Madame Grace Miller.

When she returned to Australia she landed her most famous role as Teresa in Harold Fraser-Simson's light opera The Maid of the Mountains, which she first performed in Melbourne in 1921.

[5] Contemporary critics wrote of the purity, richness, power and wide range of her voice, her conviction of style and her clear enunciation.

[7] In May 1924, Moncrieff married Thomas Henry Moore, at St James' Church, Sydney in a ceremony that attracted a large crowd.

[13] She returned to perform in musical comedy, and was engaged to entertain Australian troops fighting in the Second World War at home and in New Guinea, and she became very active raising funds for war-related charities.

Her personal papers, including correspondence, photographs, newspaper clippings and theatre programs are held at the State Library of Queensland.