Amy Frances May Gordon Jacot Guillarmod (née Hean) (23 May 1911 – 1992), was a South African botanist and limnologist, noted for her work on the flora of Basutoland and some 200 publications, including numerous papers on wetlands, bogs and sponges.

[1] In 1958 she and her family moved to Grahamstown when she took up an appointment as lecturer in the Botany Department of Rhodes University.

Her specimens number some 10 000 and are mainly from Lesotho and the Eastern Cape, housed at the following herbaria: PREM, PRE, RUH, GRA, MASE, K and MO.

[a] During her stay in Pretoria in the 1930s when working for the Department of Agriculture, she found time to play hockey, and represented Northern Transvaal.

During the same period she met a fellow employee and her future husband, the entomologist Charles Frédéric Jacot-Guillarmod (1912–1979), who later became curator of the Albany Museum.