Lierskogen is the easternmost village in Lier county, in Buskerud county, Norway. Situated in the south-east corner of Buskerud, it borders Asker (and Akershus county) to the east, and make up the eastern part of Lier county together with the nearby village of Tranby. Norway's busiest motorway, European route E18 which runs between Oslo – Drammen, goes straight through Lierskogen.
Traditionally Lierskogen has been a place dependent on farming, but after World War II many new families have moved in. There are still dairy farms in the area, however non-agriculture work is scarce. Most resident have mostly been working in nearby places like Bærum, Asker, Dikemark, Drammen and Oslo.
The old village centre was situated near Lierskogen church (Lierskogen kirke). The church dates from 1937. The edifice is masonry and seats 150. Around it was the following buildings: Gravdal bakery, Heia children school (for children aged 7–12), the society house, a small shop, a post-office and a petrol station. In 1985 Lierskogen had a population of only 800 people. But it was around this time a great building boom began.
During the second half of the 1980s two major projects was built from scratch: The Liertoppen shopping centre and nearby Norsk Medisinal Depot, a pill factory. In 1987 Liertoppen shopping centre was opened with two separate buildings and a large car park. An underground car park was also built under one of the buildings. In 1989 the two buildings was connected together with a bridge and then forming Norway's longest indoor shopping lane. In the 1990s the major building project was of several dozens new houses right behind Heia children school in the old village centre. This settlement is called "Legoland" among the villagers, due to the doll's house-like design of the houses.
Even though this settlement and several smaller ones has tripled the population to 2300 people, the commercial centre of Lierskogen has moved 1.5 km away, up to the Liertoppen shopping centre. Due to the close distance to other growing places like Drammen, Bærum, Asker and Oslo, Lierskogen has continued to grow.
Coordinates: 59°48′57″N 010°18′22″E / 59.81583°N 10.30611°E