Rhain

Rhain may refer to:


 * Wales
 * Rhain ap Cadwgan or Cloten (fl. 8th century), King of Dyfed and Brycheiniog
 * Rhain ap Maredudd (died c. 808), king of Rhainwg (Dyfed)
 * Rhain the Irishman (Rhain Yscot) (fl. 11th-century), Irish pretender who held Dyfed


 * Slovenia
 * Rhain or Rain is an ancient form of the former German name Rann of the town of Brežice and Brežice Castle (Schloss Rhain, or Schloss Rann)