Ostromecko [ɔstrɔˈmɛt͡skɔ] is a village in the administrative district of Gmina Dąbrowa Chełmińska, within Bydgoszcz County, Kuyavian-Pomeranian Voivodeship, in north-central Poland.

There is also the Baroque Saint Nicholas church and the Marian Forest nature reserve.

The beginnings of landscape protection of today's reserve date back to the 19th century.

The forested slope of the Vistula Valley was called the Maria Park, from the name of Marta Matilda Maria Alvensleben-Schönborn (1854-1915) - heir to the estate of Ostromecko and the wife of Albrecht von Alvensleben (1840-1928).

This area also has high landscape values, due to the large denivelation of the terrain, spring and groundwater exudates.