Gajno [ˈɡai̯nɔ] (German: Hermannsruh) is a settlement in the administrative district of Gmina Bierzwnik, within Choszczno County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 6 kilometres (4 mi) north-east of Bierzwnik, 26 km (16 mi) south-east of Choszczno, and 87 km (54 mi) south-east of the regional capital Szczecin.

For the history of the region, see History of Pomerania.