Muriel Mary Watt (née Lysaght; 27 March 1917 – 2 July 2005) was a New Zealand landscape architect and gardener.
In 1946, she enrolled to study at the New Zealand Institute of Horticulture, completing a three-year course.
[1][7] Her most notable work was the garden for Shirley Smith and Bill Sutch for their house in Brooklyn, Wellington.
[7] In 1953, Lysaght married John Harold Watt, a scientist who rose to become assistant director of the horticulture division of the Ministry of Agriculture and Fisheries.
[1][6] Mary Watt died in Wellington on 2 July 2005,[1] and was buried in Hāwera Cemetery.