Mantoudi is a village in the municipal unit of Kireas, Euboea, Greece. Since the 2010 local government reform, it is part of the municipality Mantoudi-Limni-Agia Anna. It was the seat of the former municipality Kireas between 1997 and 2010. In 2021 its population was 2,245. It is situated 4 km from the northeast coast of Euboea, on the river Kireas.