Cyanea mannii is a rare species of flowering plant in the bellflower family known by the common name Mann's cyanea.

It is endemic to Hawaii, where it is known only from the island of Molokai.

[2] This Hawaiian lobelioid is a shrub growing 1.5 to 3 meters tall with a palmlike cluster of leaves at the top of the stem.

The plant grows in moist forest habitat.

Threats to the species include degradation of this habitat by feral pigs and rodents.