John Dallachy (c. 1808 – 4 June 1871) was a curator of Melbourne Botanic Gardens and a plant collector.
Sailing to Australia in 1848, he took up work as a gardener for Jonathan Were in Brighton, Victoria.
Following the appointment of Ferdinand von Mueller as director, Dallachy continued as curator until 1861.
[1] From 1849 onwards, Dallachy made a number of expeditions (mainly within Victoria) to collect plant specimens.
These included:[2] His plant specimens are located in National Herbarium of Victoria| (MEL), with duplicates in the herbaria London (BM), Berlin (B), Kiel (KIEL) and Vienna (W).