Łomża Voivodeship () was an administrative division and local government in Poland in the years 1975 to 1998, superseded by the Podlaskie Voivodeship.
Its capital city was Łomża.
Cities and towns
Major cities and towns (population in 1998):
- 24px Łomża – 64,605 (1995 – 63,000)
- 24px Zambrów – 23,879 (1995 – 23,600)
- 24px Grajewo – 22,966 (1995 – 22,400)
- 24px Kolno – 11,180
Population
- 1975 – 320,200
- 1980 – 325,800
- 1985 – 338,700
- 1990 – 346,700
- 1995 – 353,800
- 1998 – 352,900