Phialanthus is a genus of flowering plants in the family Rubiaceae. There are about 20 species, 17 of which occur in Cuba.

Species include:

• Phialanthus acunae
• Phialanthus alainii
• Phialanthus bissei
• Phialanthus ellipticus
• Phialanthus glaberrimus
• Phialanthus grandifolius
• Phialanthus guantanamensis
• Phialanthus hispaniolae
• Phialanthus inflatus
• Phialanthus jamaicensis Urb.
• Phialanthus linearis
• Phialanthus lineraris
• Phialanthus macrocalyx
• Phialanthus macrostemon
• Phialanthus marianus
• Phialanthus myrtilloides
• Phialanthus oblongatus
• Phialanthus parvifolius
• Phialanthus peduncularis
• Phialanthus resinifluus
• Phialanthus revolutus Urb.
• Phialanthus rigidus
• Phialanthus stillans

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