Vestfjellet is a mountain in Holmestrand Municipality in Vestfold county, Norway.

The 634-metre (2,080 ft) tall mountain is the highest point in Vestfold county.

The mountain is located about 4.5 kilometres (2.8 mi) west of the village of Eidsfoss and about 9 kilometres (5.6 mi) to the northwest of the village of Hof.

The lake Eikeren is located to the north of the mountain.

[1] At the top of Vestfjellet, there are good panoramic views of large mountains such as Gaustatoppen and Styggmann as well as the large river Lågen and lakes such as Eikeren, Hajeren, and Øksne.