Chaldean Catholics, also known as Chaldeans, Chaldo-Assyrians or Assyro-Chaldeans, are ethnic Assyrian adherents of the Chaldean Catholic Church, which originates from the historic Church of the East.

Assyrians are an indigenous ethnic group native to Mesopotamia, a geographical region in West Asia. Modern Assyrians descend directly from Ancient Mesopotamians such as ancient Assyrians and Babylonians. Modern Assyrians may culturally self-identify as Syriacs, Chaldeans, or Arameans for religious, geographic, and tribal identification.