Unio
# Unio

Unio may refer to:

* Unio (bivalve), a genus of freshwater mussels
* Unio (sternwheeler), a steamboat that operated in Oregon, United States, in 1861, before being renamed Union
* UNI/O, an asynchronous serial bus
* UNIO Satu Mare, a Romanian machine-building company
* Utdanningsgruppenes Hovedorganisasjon or Confederation of Unions for Professionals, a national trade union center in Norway
