Johanna Ellaphie Ward-Hilhorst (10 July 1920 Pretoria – 30 June 1994 Cape Town) was a South African botanical artist.
After matriculating from Pretoria Girls' High School she started work in 1939 as a cartographer in the Survey Department of the Witwatersrand Gold Mines.
At the end of World War II, she moved to the Netherlands to study watercolour painting under the eye of her uncle Gerhardus Hilhorst, a distinguished natural history artist.
Other genera on which she worked included Sarcocaulon, Haemanthus, Rhus, Plectranthus, Hessea, Strumaria, as well as Gasteria, Serruria and Diascia.
The Botanical Society of South Africa awarded her the Cythna Letty Medal in 1988: the South African Association of Botanists conferred the Certificate of Merit on her contribution to systematic botany and in 1990 she received a Gold Medal for the Haemanthus paintings at the Royal Horticultural Society Exhibition in London.