Hesperomannia (island-aster) is a genus of flowering plant in the family Asteraceae.

Hesperomannia is endemic to Hawaii and consists of four species:

• Hesperomannia arborescens A.Gray – Lanai hesperomannia
• Hesperomannia arbuscula Hillebr. – Maui hesperomannia
• Hesperomannia lydgatei C.N.Forbes – Kauai hesperomannia
• Hesperomannia oahuensis (Hillebr.) O.Deg.
• Hesperomannia swezeyi O.Deg.

Although traditionally classified in the tribe Mutisieae, molecular evidence shows that it belongs in the tribe Vernonieae, most closely related to the African Vernonia species.

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