Guidonia

Guidonia may refer to:
 * Guidonia Montecelio, an Italian town
 * Guidonia P.Browne, a synonym of the plant genus Laetia
 * Guidonia (DC.) Griseb. and Guidonia Mill., both synonyms of the plant genus Samyda
 * Guidonia (gastropod), an extinct genus; see List of gastropods described in 2010