Kolno pronounced [ˈkɔlnɔ] is a town in northeastern Poland, located in the Podlaskie Voivodeship, about 150 km northeast of Warsaw.

As a result of the fragmentation of Piast-ruled Poland, it formed part of the provincial Duchy of Masovia, before it was reincorporated directly to the Polish Crown.

Kolno was a royal town of the Polish Crown, administratively located in the Masovian Voivodeship in the Greater Poland Province.

On 25–26 August 1920, the Battle of Kolno was fought, in which the Polish 14th Infantry Division defeated the invading Soviets.

[citation needed] On 5 1941 Hermann Göring and Erich Koch visited the town, and some 30 to 37 Jews were murdered by the local Poles.

[6] The Soviet Army liberated Kolno on the night of 23–24 January 1945 and ceded the town back to Poland, however, with a Soviet-installed communist regime, which remained in power until the Fall of Communism in the 1980s