Eubranchidae is a family of nudibranchs, shell-less marine gastropod molluscs or sea slugs, within the superfamily Fionoidea. They are the only known fionoid family with a triserial radula, this is, its central teeth are flanked by one longitudinal row of lateral teeth on each side.
In 2016, a molecular phylogenetics study by Cella and colleagues placed various fionoid taxa in the family Fionidae. In 2017, Korshunova and colleagues resintated several of these lumped families due to their considerable morphological and molecular pattern differences from each other. Differences, such as the tricerial radula unique to Eubranchidae among fionoids, the authors argue should grant the usage of more narrowly-defined families.
Genera within the family Eubranchidae include: