Gąsawa [ɡɔ̃ˈsava] (German: Gonsawa is a village in Żnin County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It is the seat of the gmina (administrative district) called Gmina Gąsawa. It lies approximately 10 kilometres (6 mi) south of Żnin and 43 km (27 mi) south-west of Bydgoszcz. The village has a population of 1,400.

Gąsawa received the city rights in 1388 and lost them in 1934.

It is famous as the place of the assassination of the Leszek I the White, prince of Poland (November 23, 1227). In 1600 Gąsawa hosted the Lubrański Academy (Polish: Kolegium Lubrańskiego) which temporarily moved out of plague-stricken Poznań.

The main tourist attraction in Gąsawa is the 17th century wooden St. Nicolas Church with a unique collection of multi-layered mural paintings, the earliest from the 17th century, and the most recent from 1807.

The church itself, a larch construction with a slate roof, was in a such a bad state around 1850 that local officials asked the regional Prussian government to allow the church to be dismantled and build a new one instead. The response gave permission to only overhaul the building. Existing wall paintings were covered with a layer of reed and ordinary plaster, and forgotten for some 150 years.