Siambr

Siambr or Y Siambr [] may refer to:


 * Y Siambr, the Welsh Parliament or Senedd's debating chamber
 * Tŷ Hywel (Siambr Hywel), its former, now youth, chamber
 * Y Siambr (TV series), an S4C game show
 * Any chambered cairn in Wales
 * Siambr Trawsfynydd, a mountain in West Wales