Marynino [marɨˈninɔ] is a village in the administrative district of Gmina Serock, within Legionowo County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) west of Serock, 15 km (9 mi) north-east of Legionowo, and 34 km (21 mi) north of Warsaw. Marynino is a rural area with only a few roads and many family farms.