Kreis Ostrowo (Polish: Powiat ostrowski) was a county in the southern administrative district of Posen, in the Prussian province of Posen. It presently lies in the southern part of Polish region of Greater Poland Voivodeship.

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51°39′00″N 17°42′00″E / 51.650000°N 17.700000°E / 51.650000; 17.700000