Niemirów [ɲɛˈmʲiruf] is a village in the administrative district of Gmina Mielnik, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus.

Swedish and Transilvanian invasion of Poland (1655–1660) had catastrophic consequences for the town, as it was completely destroyed, and in 1662 its population was only 88.

Due to efforts of Chancellor of the Polish-Lithuanian Commonwealth in 1755 Niemirów was granted the right for two weekly markets and two annual fairs.

[2] In September 1939, Soviet authorities forced most residents to leave the town, as Soviet-German border was established nearby (see Molotov–Ribbentrop Pact).

Niemirow also has a gate with a bell tower (1823), and near the village there is the so-called Castle Hill, with a medieval gord, which once guarded Bug river crossing.