Łomża is a city in north-eastern Poland, approximately 150 kilometres (90 miles) from Warsaw and from Białystok. It is situated alongside the Narew river as part of the Podlaskie Voivodeship since 1999. Previously, it was the capital of the Łomża Voivodeship from 1975 to 1998. It is the capital of Łomża County and has been the seat of the Roman Catholic Diocese of Łomża since 1925.
Łomża is one of the principal economic, educational, and cultural centres of north-eastern Masovia as well as one of the three main cities of Podlaskie Voivodeship (beside Białystok and Suwałki). It lends its name to the protected area of Łomża Landscape Park. The town is also the location of the Łomża Brewery.