Cirta, also known by various other names in antiquity, was the ancient Berber, Punic and Roman settlement which later became Constantine, Algeria.

Constantine, also spelled Qacentina or Kasantina, is the capital of Constantine Province in northeastern Algeria. During Roman times it was called Cirta and was renamed "Constantina" in honour of Emperor Constantine the Great. Located somewhat inland, Constantine is about 80 kilometres from the Mediterranean coast, on the banks of the Rhumel River.