Gretteåsen is a village in Tønsberg Municipality in Vestfold county, Norway. The village is located about 12 km north of the city of Tønsberg, about 7 km west of the city of Horten, and about 5 km east of the village of Revetal. The European route E18 highway and the Undrumsdal Church are both located about 1 km east of the village. The 0.09 km2 village has a population (2023) of 233 and a population density of 2697 PD/km2.