Acoela é uma classe de animais do subfilo Acoelomorpha.
Famílias Actinoposthiidae Hooge, 2001 Anaperidae Dörjes, 1968 Antigonariidae Dörjes, 1968 Antroposthiidae Faubel, 1976 Childiidae Dörjes, 1968 Convolutidae Graff, 1905 Dakuidae Hooge, 2003 Diopisthoporidae Westblad, 1940 Hallangiidae Westblad, 1946 Haploposthiidae Westblad, 1948 Hofsteniidae Bock, 1923 Isodiametridae Hooge e Tyler, 2005 Mecynostomidae Dörjes, 1968 Nadinidae Dörjes, 1968 Otocelididae Westblad, 1948 Paratomellidae Dörjes, 1968 Polycanthiidae Hooge, 2003 Proporidae Graff, 1882 Sagittiferidae Kostenko & Mamkaev, 1990 Solenofilomorphidae Dörjes, 1968 Taurididae Kostenko, 1989