The BI Norwegian School of Management (Norwegian: Handelshøyskolen BI) is Norway's largest private business school, headquartered in Nydalen, Oslo, Norway. The school was founded in 1943 by Finn Øien. The current president is professor Tom Colbjørnsen.

As of 2005 the school has roughly 18,700 students, about 10,000 of them full-time, and a faculty of 716. There is a full set of programs: Undergraduate, master, doctoral, as well as executive and on-site programs for businesses.

There are two student unions at Norwegian School of Management, one for the main location in Oslo and one for all the smaller locations throughout Norway. The Student Union in Oslo is called "Studentforeningen ved Handelshøyskolen BI i Oslo" (SBIO) which translates into "The Student Union at Norwegian School of Management in Oslo". This union was formed in 2005 after the relocation of the three locations in Oslo into one - Campus Nydalen. The three previous unions was called Bedriftøkonomisk Studentersamfund (BS), BISON and MØSS. BS was the oldest union, formed in 1964. The Student Union for all the other locations is called "BI Studentsamfunn™ (BIS) which translates to BI Student Society, and covers all campuses except the one in Nydalen, Oslo. The Society was founded on February 7 1987 and is today the largest student union of a private school in Norway.