Demirchyan or Demirchian or Demirjian (, Western Armenian Տէմիրճեան, derived from Turkish demirci [demir "iron" + ci "agentive suffix"], meaning "blacksmith") is an Armenian surname. Notable people with the surname include:
Demirchyan Derenik Demirchian (1877–1956), Georgian-born Armenian poet, writer, translator and playwright Hovhannes Demirchyan (born 1975), Armenian footballer Karen Demirchyan (1932–1999), Soviet Armenian communist politician Stepan Demirchyan (born 1959), Armenian politician
Demirjian Alexis Demirdjian (born 1976), Canadian lawyer Eddie Demirjian, Lebanese Armenian politician Hovig Demirjian (born 1989), Cypriot Armenian singer, also known by the mononym Hovig Karoun Demirjian (born 1981), American Armenian journalist Adam Demirjian, former member of The Brave Little Abacus