Prosomphax is a very small genus in the geometer moth family (Geometridae). As of 2005, only four species had been described; all are found in the southern half of Africa. This little-studied genus belongs to the emerald moth subfamily (Geometrinae), but beyond that its relationships are still rather obscure.

The species of Prosomphax are:

• Prosomphax callista Warren, 1911
• Prosomphax deuterurga Prout, 1922
• Prosomphax anomala (Warren, 1902)
• Prosomphax horitropha Krüger, 2005

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