The Deceangli or Deceangi (Welsh: Tegeingl) are one of the Celtic tribes living in Britain, prior to the Roman invasion of the island.

The tribe lives mainly in what is now northeast Wales, though it is uncertain whether their territory covered only the modern counties of Flintshire, Denbighshire and part of Cheshire in what is now present day England or whether it extended further west.

The tribe occupies an area between the Clwyd and Dee rivers.

They live in hill forts running in a chain through the Clwydian Range and their tribal capital was Canovium.