Constance Mary Le Plastrier (23 January 1864 – 7 February 1938) was an Australian schoolteacher, botanist and writer.

Shortly before her death she received the Cross of Pope Leo XIII (pro Ecclesia et Pontifice).

[2] She moved to Sydney in 1900 where she was employed by Redlands School in Cremorne, teaching English, Latin and botany.

[4] She joined the Field Naturalists' Society of New South Wales in about 1912 and in 1919 was elected president, the first woman to fill that role.

[5] Le Plastrier died in the Mater Misericordiae private hospital in North Sydney on 7 February 1938.