Trzcianne [ˈtʂt͡ɕannɛ] (Yiddish: טרעסטיני, Trestiny) is a village in Mońki County, Podlaskie Voivodeship, in north-eastern Poland. It is the seat of the gmina (administrative district) called Gmina Trzcianne. It lies approximately 11 kilometres (7 mi) south-west of Mońki and 41 km (25 mi) north-west of the regional capital Białystok. It is close to Biebrza National Park. The village has a population of 610.
First records of Trzcianne come from the 13th century. The name probably comes from reeds (Polish: trzcina) surrounding the river that flowed through the village. According to the records of Aleksander Jagiellon, Grand Duke of Lithuania, the first Catholic church in Trzcianne was built before 1496. It survived for ca. 100 years. The current, fourth church in Trzcianne was built in 1846 and consecrated in 1860.
For centuries, there were also many Jews living in Trzcianne (see shtetl), and there still is an old Jewish cemetery in the village. About 1,200 Jews were deported to Treblinka during the Holocaust. Both during and after World War II, many inhabitants of Trzcianne were also deported to Kazakhstan by the Soviets.