Arno Berg (14 February 1890 – 1 June 1974) was a Swedish born, Norwegian architect and antiquarian.

He was initially employed by architects Andreas Hesselberg Bjercke (1883-1967) and Georg Christen Eliassen (1880-1964) who at this time had won an architectural competition for the entry of a new office building for the head office of Norwegian America Line (Den norske Amerikalinje) in Oslo.

He was then contacted by city architect Harald Aars (1875-1945) and asked to be a secretary of the heritage association Selskabet for Oslo Byes Vel.

Among his publications are Selskabet for Oslo Byes Vels historie 1811–1861 from 1936, Vår Frelsers kirke from 1950, and a two-volume work on Akershus Fortress.

A bust of Arno Berg by sculptor Arnold Haukeland was unveiled at Oslo Ladegård in 1972.