Habenaria harroldii is a tuberous, perennial herb with between three and five upright, dark green leaves at its base, the leaves long and wide. Between three and twenty five lightly scented white flowers, long and wide are borne on a flowering stem tall. The dorsal sepal is long and about wide, overlapping with the base of the petals to form a hood over the column. The lateral sepals are long, about wide and spread widely apart from each other. The petals are long and about wide. The labellum is long, about wide and usually undivided. The nectary spur is long and more or less straight. Flowering occurs from January to March.
