This article discusses late Viking Age mortuary practices in the town of Sigtuna during the early urban phase (c. 980–1100 AD) with focus on the so-called graveyards (Sw. gravgårdar): cemeteries where the dead were inhumed mainly in accordance with Christian customs, but that lacked churches. It aims to trace cultural, social, or religious communities among the early town dwellers based on an analysis of their burial rituals, in combination with results of osteological and bioarcheological studies of their physical remains. The paper shows that burial customs varied within the early townscape: the dead were laid to rest under visible grave constructions in exposed topographical locations, as well as on flat-ground cemeteries in lower terrain close to the settlement area or at early churchyards. Moreover, diversity in mortuary customs, sex and age distribution, gender division, and diet can be detected between individual cemeteries, indicating that they were used by different urban groups that to some extent parted from their dead in different ways. The results of bioarcheological analyses indicate a heterogenous early urban population, comprising people from the Mälaren area, and also from distant regions. The burial customs reflect this specific urban situation, bearing witness to both long-distance contacts and roots in local mortuary traditions.