Thiseio (Greek: Θησείο)
is the name of a neighborhood in downtown Athens, Greece, northwest of the Acropolis, 1.5 km southwest of downtown;
its name derives from the Temple of Hephaestus, also known as Τhiseio, as it was, in earlier times, considered a temple of Theseus.
The historical Agioi Asomatoi church is situated in Thiseio.
The area has cafes and meeting points, which are most crowded during summer.
Thiseio is served by the nearby ISAP Thiseio metro station.