Knyszyn is a town in north-eastern Poland.

Situated in the Podlasie Voivodship (since 1999), previously in Bialystok Voivodship (1975-1998).

Originally, belonged to Grand Duchy of Lithuania.
In 1569 annexed by Polish crown.
1795 to Prussia, 1806 to Russia, 1919 back to Poland.
1939-1941 Soviet Union, 1941-1944 Bialystok Bezirk asscociated to Gau East Prussia .

The place of death of the king Sigismund II of Poland , one of his favourite residence.