Reussia

Reussia may refer to:
 * Reussia (bryozoan), a genus of bryozoans in the family Bryocryptellidae
 * Reussia, a genus of plants in the family Rubiaceae, synonym of Paederia
 * Reussia, a genus of protists (foraminifers) in the family Reussellidae, synonym of Reussella