Isotoma pusilla, commonly known as small isotome, is a small herbaceous perennial in the family Campanulaceae native to Western Australia.^[1]

The erect, spreading, slightly succulent and annual herb typically grows to a height of 0.02 to 0.12 metres (0.1 to 0.4 ft). It blooms between October and December producing blue-purple flowers.

It is found in wet depressions along the west coast in the South West, Wheatbelt and Mid West regions of Western Australia where it grows in sandy-clay soils.^[1]