Sem is a settlement in Vestfold, Norway. Sem lies at 21 m above sea level. It has 2,776 inhabitants (2025). The nearest city is Tønsberg, 4.8 km to the east. Beaches nearby: Sandodden (4 km), Melsomstranda (7.2 km), Hellastranda (6.7 km). Among the landmarks around are Gokstad Mound (16.3 km), Borre mound cemetery (13.8 km) and Tønsberg Cathedral (4.5 km). Among the natural features are Slottsfjellet (4.4 km) and Haugar (4.9 km).