Megalo Seirini

Megalo Seirini (Μεγάλο Σειρήνι) is a village and a community of the Grevena municipality. Before the 2011 local government reform it was a part of the municipality of Grevena, of which it was a municipal district. The 2021 census recorded 405 residents in the community. The community of Megalo Seirini covers an area of 18.804 km2.

Administrative division
The community of Megalo Seirini consists of two separate settlements:
 * Megalo Seirini (population 331 as of 2021)
 * Mikro Seirini (population 74)