Jacksonia macrocalyx is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia.

The stamens have white to pale green filaments 2.4–7 mm (0.094–0.276 in) long.

[2][3] Jacksonia macrocalyx was first formally described in 1855 by Carl Meissner in the journal Botanische Zeitung from specimens collected by James Drummond.

[6] This species of Jacksonia grows in shrubland on sand over laterite from north of Mingenew to Wongan Hills in the Avon Wheatbelt and Geraldton Sandplains bioregions of south-western Western Australia.

[2][3] Jacksonia macrocalyx is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.