James Donn (1758–1813) was an English botanist and gardener.^[1] He was trained by William Aiton, a protege of Sir Joseph Banks and was Curator of the Cambridge University Botanic Garden, Cambridge, from 1790 until his death.^[2][3] His most important work was Hortus Cantabrigiensis, first published in 1796 but with several later, much expanded, editions. It carried on past his death until 1845.^[4]

A copy was given to the Library of the Gray Herbarium of Harvard University in 1895.^[5]

He became a Fellow of the Linnean Society in 1812.^[1]

A memorial to James Donn, exists on St Edward the Martyr's church in Cambridge.^[6]

A grandson was the English composer William Sterndale Bennett.^[2][7]