Harrisia gracilis is a species of cactus found in Jamaica.

Harrisia gracilis grows shrubby, is richly branched and forms groups with upright to spreading shoots.

They are grayish ocher or gray, almost completely covering the shoots and are up to 2.5 centimeters long.

[4] The specific epithet gracilis means 'delicate, slim, thin'.

Nathaniel Lord Britton placed the species in the genus Harrisia in 1909.