Keramikos (Greek: Κεραμεικός), also known by its Latinized form Ceramicus, is an area of Athens, Greece, located to the northwest of the Acropolis, which includes an extensive area both within and outside the ancient city walls, on both sides of the Dipylon (Δίπυλον) Gate and by the banks of the Eridanos River. It was the potters' quarter of the city, from which the English word "ceramic" is derived, and was also the site of an important cemetery and numerous funerary sculptures erected along the road out of the city towards Eleusis.
The area took its name from the city square or dēmos (δῆμος) of the Kerameis (Κεραμεῖς, potters), which in turn derived its name from the word κέραμος (kéramos, "pottery clay", from which the English word "ceramic" is derived). The "Inner Kerameikos" was the former "potters' quarter" within the city and "Outer Kerameikos" covers the cemetery and also the Dēmósion Sēma (δημόσιον σῆμα, public graveyard) just outside the city walls, where Pericles delivered his funeral oration in 431 BC. The cemetery was also where the Ηiera Hodos (the Sacred Way, i.e. the road to Eleusis) began, along which the procession moved for the Eleusinian Mysteries. The quarter was located there because of the abundance of clay mud carried over by the Eridanos River.
The area has undergone a number of archaeological excavations in recent years, though the excavated area covers only a small portion of the ancient dēmos. It was originally an area of marshland along the banks of the Eridanos river which was used as a cemetery as long ago as the 3rd millennium BC. It became the site of an organised cemetery from about 1200 BC; numerous cist graves and burial offerings from the period have been discovered by archaeologists. Houses were constructed on the higher drier ground to the south. During the Archaic period increasingly large and complex grave mounds and monuments were built along the south bank of the Eridanos, lining the Sacred Way.