Mjøstårnet is an 18-storey mixed-use building in Brumunddal, Norway, completed in March 2019. At the time of completion, it was officially the world's tallest wooden building, at 85.4 m (280 ft) tall, before being surpassed by Ascent MKE in August 2022. Mjøstårnet translates as "the tower of lake Mjøsa". The building is named after Norway's biggest lake, which is 100 km away from Oslo.

Mjøstårnet has a combined floor area of around 11,300 m (122,000 sq ft). The building offers a hotel, apartments, offices, a restaurant and common areas, as well as a swimming pool in the adjacent first-floor extension. This is about 4,700 m (51,000 sq ft) in size and also built in wood.

Mjøstårnet was designed by Norwegian studio Voll Arkitekter for AB Invest. Timber structures were installed by Norwegian firm Moelven Limtre, including load-bearing structures in glued laminated timber. Cross laminated timber were used for stairwells, elevator shafts and balconies.

As the main vertical/lateral structural elements and the floor spanning systems of Mjøstårnet are constructed from timber, the building is considered an all-timber structure. An all-timber structure may include the use of localized non-timber connections between timber elements. It may also include non-timber floors as long as the decks are supported by a primary structure made in timber (resting on timber beams). In Mjøstårnet, concrete slabs were used on the top seven floors in order to handle comfort criteria and acoustics.

The next tallest wooden building is the 84 m (276 ft), 24-storey high HoHo Tower in Vienna, Austria. However, this building is a timber-concrete composite building since it has a concrete core stabilizing the building, according to the definition of CTBUH.

The Japanese wood products company Sumitomo Forestry is proposing to build the W350 Project a 350 m (1,150 ft), 70-floor tower to commemorate its 350th anniversary in 2041.

60°52′39″N 10°55′51″E / 60.8774°N 10.9309°E / 60.8774; 10.9309