Eucarpha is a genus of flowering plant of the family Proteaceae, endemic to New Caledonia. Two species are recognised. Up to 1975, these were classified within the genus Knightia until Lawrence Johnson and Barbara G. Briggs recognised their distinctness, particularly their prominent bracts, in their 1975 monograph "On the Proteaceae: the evolution and classification of a southern family". Nomenclatural combinations for these two species in the genus Eucarpha were published in 2022.
In 2006, the genus was placed in the tribe Roupaleae. Its closest relative is the Australian Triunia.Sauquet, H., P. H. Weston, C. J. Anderson, N. P. Barker, D. J. Cantrill, A. R. Mast, and Savolainen, V. (2009). Contrasted Patterns of Hyperdiversifaction in Mediterranean Hotspots. Proceedings of the National Academy of Sciences of the USA 106 (1): 221–25.
Species , Plants of the World Online accepted two species: Eucarpha deplanchei (Vieill. ex Brongn. & Gris) P.H.Weston & Mabb., syn. Knightia deplanchei Vieill. ex Brongn. & Gris Eucarpha strobilina (Labill.) P.H.Weston & Mabb., syn. Knightia strobilina (Labill.) R.Br. ex Meisn.
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