Sejkov is a municipality in Sobrance District, in the Košice Region, Slovakia. Sejkov lies at 116 m above sea level, 6.3 km from the Vihorlat mountains. It has 205 inhabitants (2025). The nearest city is Michalovce, 24 km to the west. Near the border: Ukraine, 4.3 km. Among the landmarks around are Uzhhorod Castle (9.1 km), Greek Catholic Cathedral (8.8 km) and Church of Saint Nicolas of Ruská Bystrá (20 km). Among the natural features are Masaryk Ash (8.6 km).