The Banjarmasin War (in old spelling Bandjermasin War, Dutch: Bandjermasinse Oorlog, or formally Expeditie naar de Zuider- en Oosterafdeling van Borneo) (1859–1863) was a war of succession in the Sultanate of Banjarmasin, as well as a colonial war for the restoration of Dutch authority in the eastern and southern section of Borneo.