Bærum is a municipality in the county of Akershus, Norway. Bærum is located on the coast, west of Oslo. Sandvika is the administrative centre of Bærum.

Located just to the west of the Oslo, Bærum is in many respects regarded as a suburb. Many technology oriented companies are located at Lysaker and Fornebu.

Built-up areas such as Slependen , Sandvika, Kolsås , Høvik , Lysaker , Stabekk , Bekkestua , Haslum , Hosle , Eiksmarka , and Østerås can be said to have grown together with Oslo. However, they are not typically urban districts in the strictest sense.

Although Bærum is in many eyes regarded as a prototypical affluent suburb to Oslo, Bærum certainly has a history and identity of its own. Its history includes iron industry embodied in Bærums Jernverk founded in the 1700s. Bærum has got a lot of outlying field, such as Krokskogen in Lommedalen. Bærum has two stone churches from the 1100's. The Henie-Onstad Art Centre, founded by Sonja Henie and her husband Niels Onstad is an well-known art museum and architectural center located at Høvikodden.

A local football team, Stabæk I.F., played in the Norwegian premier league (2004), but were relegated at the end of the season.