Viola lanaiensis is a rare species of flowering plant in the violet family known by the common name Hawaii violet. It is endemic to Hawaii, where it is known only from the island of Lanai. It is threatened by deer, sheep, and introduced species of plants. It is a federally listed endangered species of the United States. This plant is a subshrub which grows 10 to 40 centimeters tall. It produces narrow leaves and purple-tinged or purple-veined white flowers. It grows in moist and wet forest habitat.