Rosia
Rosia may refer to:
- Rosia (Ῥωσία), the Greek name for Rus' (region)
 - Rosia, Sovicille, a village in Tuscany, Italy
 - Roșia (disambiguation), villages in Romania
 - Roșia Montană, a commune in Romania
 - Roșia, a tributary of the river Dorna in Romania
 - Rosia Airfield, a World War II military airfield
 - Rosia Bay, the only natural harbour in Gibraltar