The Stoa of Attalos was a stoa in the Agora of Athens, Greece. It was built by and named after King Attalos II of Pergamon, who ruled between 159 BC and 138 BC. The building was reconstructed from 1952 to 1956 by the American School of Classical Studies at Athens and currently houses the Museum of the Ancient Agora.

The ancient Agora of Athens is the best-known example of an ancient Greek agora, located to the northwest of the Acropolis and bounded on the south by the hill of the Areopagus and on the west by the hill known as the Agoraios Kolonos, also called Market Hill. The Agora's initial use was for a commercial, assembly, or residential gathering place.