Ostroleka Voivodship (Polish: województwo ostrołęckie) was a unit of administrative division and local government in Poland in years 1975-1998, superseded by Masovian Voivodship.

Capital city: Ostroleka

Major cities and towns: (population in 1995):

• Ostroleka (53,700);
• Wyszkow (25,300);
• Ostrow Mazowiecka (22,000).

See also:

• Voivodships of Poland