Ymittos () is a town and a suburb in the Athens urban area, Greece. Since the 2011 local government reform it is part of the municipality Dafni-Ymittos, of which it is a municipal unit. With a land area of 0.975 km<sup>2</sup>, it was the second-smallest municipality in Greece (after Nea Chalkidona) before 2011. It is situated 2.5 km southeast of the Acropolis of Athens. Ymittos has two high schools.