Lysaker is an area in Bærum municipality, Akershus county, Norway. Lysaker is the easternmost part of Bærum, and borders Oslo proper. Lysaker was initially a farming community, later becoming a residential area. Today it is primarily known as a business and trade area, and a public transport hub. It is considered part of Stor-Oslo (Greater Oslo), and is home to the offices of numerous national and international businesses.