The genus name Axia may refer to:

  • Animalia:
    • Axia Hübner, 1821 ( Lepidoptera, Cimeliidae)
    • Axia Leach, 1816 = orth. var. of Axius Leach, 1816 (Malacostraca, Axiidae)
    • Axia Eschscholtz, 1825, junior homonym = synonym of Axiotima Eschscholtz, 1829 (Ctenophora, Lobata)
    • Axia H.Milne Edwards, 1873 = orth. var. of Axius Leach, 1816 (Malacostraca, Axiidae)
    • Axia Ferguson, 1954, junior homonym = synonym of Macrostomum Schmidt, 1848 (Platyhelminthes; Macrostomidae)
    • Axia Luther, 1955, junior homonym = synonym of Axiola Luther, 1957 (Platyhelminthes, Jenseniidae)
  • Plantae:
    • Axia Lour. (1790) = synonym of Boerhavia L. (Caryophyllales, Nyctaginaceae)