Marcewo [marˈt͡sɛvɔ] is a village in the administrative district of Gmina Słupca, within Słupca County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 8 kilometres (5 mi) north-east of Słupca and 70 km (43 mi) east of the regional capital Poznań. The village has a population of 100.