Pyke is the stronghold and seat of House Greyjoy, located on the island of the same name, which is one of the seven major Iron Islands. The castle is the regional capital of the Iron Islands as a whole.

Pyke is so old that its original builders and lords are unknown. The castle was once larger and located on the island of Pyke, but unstable earth led to some portions of the cliff falling into the sea. The surviving structures are built upon stone stacks. The towers are connected by swaying rope bridges. The rocky moss covered stone at its base is not suitable for ships landing so traffic to the island flows through the nearby harbor town Lordsport.

It is currently the seat of Yara Greyjoy, the Queen of the Iron Islands.