Rajsko [ˈrai̯skɔ] is a village in the administrative district of Gmina Opatówek, within Kalisz County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 7 kilometres (4 mi) east of Opatówek, 17 km (11 mi) east of Kalisz, and 120 km (75 mi) south-east of the regional capital Poznań.