Soyauxia is a genus of flowering plants in the family Peridiscaceae. They are small trees or erect shrubs from wet forests of tropical West Africa. Eight specific names have been published in Soyauxia. Additional species have been discovered, but their names and descriptions will not be published until 2009 or 2010. The type species for the genus is Soyauxia gabonensis.

Soyauxia was long considered an anomaly and it has been variously classified by different authors, usually in Passifloraceae or in the defunct plant family Flacourtiaceae. The first molecular phylogenetic study to include Soyauxia placed it in Peridiscaceae. Its position within that family was determined in 2009.

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