Marcewek [marˈt͡sɛvɛk] is a village in the administrative district of Gmina Słupca, within Słupca County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 9 kilometres (6 mi) north-east of Słupca and 73 km (45 mi) east of the regional capital Poznań.

The village has an approximate population of 190.