Balthazar Conrad Lange (25 March 1854 - 13 September 1937) was a Norwegian architect.
He was born in Asker as a son of customs treasurer and lieutenant colonel Christopher Andreas Lange (1808–1888) and Anne Birgithe Falsen.
He was a maternal grandson of founding father Christian Magnus Falsen, grandnephew of Alexander Lange, first cousin of naval officer Christian Magnus Falsen and Conrad Falsen and first cousin once removed of Christian Christoph Andreas Lange and Jacob Otto Lange.
[1] The couple had one daughter and five sons, although not all survived past infancy.
He mainly designed station buildings in Østfold and Vestfold, including Skoppum, Stokke, Sandefjord, and Porsgrunn.