Gmina Rościszewo is a rural gmina (administrative district) in Sierpc County, Masovian Voivodeship, in east-central Poland.

Its seat is the village of Rościszewo, which lies approximately 9 kilometres (5 mi) north-east of Sierpc and 112 km (69 mi) north-west of Warsaw The gmina covers an area of 115.08 square kilometres (44.4 sq mi), and as of 2006 its total population is 4,216.

Gmina Rościszewo contains the villages and settlements of Babiec Piaseczny, Babiec Rżały, Babiec-Więczanki, Borowo, Bryski, Komorowo, Kownatka, Kuski, Lipniki, Łukomie, Łukomie-Kolonia, Nowe Rościszewo, Nowy Zamość, Ostrów, Pianki, Polik, Puszcza, Rościszewo, Rumunki-Chwały, Rzeszotary-Chwały, Rzeszotary-Gortaty, Rzeszotary-Pszczele, Rzeszotary-Stara Wieś, Rzeszotary-Zawady, Śniedzanowo, Stopin, Topiąca, Września and Zamość.

Gmina Rościszewo is bordered by the town of Sierpc and by the gminas of Bieżuń, Lutocin, Sierpc, Skrwilno, Szczutowo and Zawidz.