The genus name Agnesia may refer to:
- †Agnesia Koninck, 1883 (Porcelliidae, Gastropoda, Animalia)
- Agnesia Michaelsen, 1912 = Agnezia Monniot & Monniot, 1991 (Agneziidae, Chordata, Animalia)
- Agnesia Zuloaga & E.J.Judziewicz (Poaceae, Magnoliophyta, Plantae)