Rhain may refer to:
;Wales
*
Rhain ap Cadwgan or Cloten (fl. 8th century), King of Dyfed and Brycheiniog
*
Rhain ap Maredudd
Rhain son of Maredudd ( cy, Rhain ap Maredudd; died c. 808) was a king of Dyfed. He ruled following his father Maredudd ap Tewdws and was succeeded by his brother Owain. His son Triffyn then succeeded Owain.
His lineage is included among the H ...
(died c. 808), king of Rhainwg (Dyfed)
*
Rhain the Irishman
Rhain was an 11th-century king of Dyfed.
It is unclear when his reign began. He claimed to be the son of Maredudd ab Owain and was apparently accepted as such by the people of Dyfed and the anonymous author of the C text of the ''Annals of Wales' ...
(''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
Brežice Castle ( sl, Grad Brežice, german: Schloss Rann) is a 16th-century castle in the town of Brežice, in southeastern Slovenia, at the street address ''Cesta prvih borcev 1''.
As with the town, the castle's name derives from the diminutive ...
(''Schloss Rhain'', or ''Schloss Rann'')
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