Kadifekale (literally "the velvet castle" in Turkish) is the name of the hill located within the urban zone of İzmir, Turkey, as well as being the name of the ancient castle on top of the same hill.

Both the hill and the castle were named Pagos (Pagus under the Roman Empire) in pre-Turkish times.

The summit where the castle is found is located at a distance of about 2 km from the shoreline and commands a general view of a large part of the city of İzmir, as well as of the Gulf of İzmir.

Administratively, the hill area covers six quarters constituted by slums in their large part, one named Kadifekale like the hill, and others Alireis, Altay, İmariye, Kosova and Yenimahalle.

In 2007, the metropolitan municipality of İzmir started renovation and restoration works in Kadifekale.

The first recorded defensive walls built here was the work of Lysimachos, a "successor" (diadochus) of Alexander the Great, later a king (306 BC) in Thrace and Asia Minor. This construction was associated with Alexander's re-foundation of Smyrna, moving it from Old Smyrna on a mound in the southeastern corner of the inner gulf where only a few thousand people could be accommodated. This move for the location of a new and larger city gained fame in a legend told by Pausanias, according to which Alexander, during a rest after hunting under a plane tree near the sanctuary on the hill of the two Nemeseis worshipped by the Smyrneans, was approached during his sleep by the goddesses who bade him found a city on that very spot, transferring to it the inhabitants of the earlier site. Upon this, the famous oracle in Klaros was consulted and the answer received was;