Cymer or Cymmer may refer to:
- Cymer, a company making light sources for semiconductor fabrication
- Cymer Abbey a Cistercian abbey in Wales
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
disambiguation page lists articles about distinct geographical locations with the same name.
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