Cymmer

Cymer or Cymmer may refer to:
 * Cymer Abbey a Cistercian abbey in Wales
 * Cymmer Colliery explosion, a mining accident in the Rhondda Valley in 1856

There are several places in Wales named Cymmer (standard Welsh: Cymer, meaning "confluence").
 * Cymmer, Rhondda Cynon Taf, a village and community near Porth
 * Cymmer, Neath Port Talbot, a village in the Afan Valley (also spelt Cymer)
 * Cymer (Edeirnion) (sometimes spelt Cymmer), a place in the former parish of Llangar, Denbighshire