Annia may refer to:
Annia gens, an ancient Roman clan
Any Roman woman of the gens (see for list), including:
Paculla Annia, a priestess involved in the suppression of the Bacchanalia in 186 BC
Via Annia, a Roman road in Cisalpine Gaul named for a member of the gens Annia
Annia (insect), a disused synonym for a genus of praying mantises
