Trzcianka is a town in the Greater Poland region in northwestern Poland. Since 1999, it has been part of the Greater Poland Voivodeship and Czarnków-Trzcianka County. From 1975 to 1998, it was located in the Piła Voivodeship. In May 2007, Trzcianka had 17,131 inhabitants. Trzcianka is located on the Trzcianka River, and three lakes, Sarcze, Okunie and Długie, are located within the town limits.

Greater Poland Voivodeship is a voivodeship, or province, in west-central Poland. It was created on 1 January 1999 out of the former Poznań, Kalisz, Konin, Piła and Leszno Voivodeships, pursuant to the Polish local government reforms adopted in 1998. The province is named after the region called Greater Poland or Wielkopolska. The modern province includes most of this historic region, except for some western parts.