Adolf II (23 February 1883 – 26 March 1936) was the last ruler of the small Principality of Schaumburg-Lippe in northwestern Germany from 29 April 1911 until his abdication on 15 November 1918.

Adolf was born in Stadthagen, the only other town in the principality apart from the capital Bückeburg, to the then hereditary Prince Georg (1846–1911) and Princess Marie Anne of Saxe-Altenburg (1864–1918).

All fourteen people on board the airplane, ten tourists from Europe and four crew members, died when the plane crashed between two volcanos.

His youngest brother Prince Friedrich Christian of Schaumburg-Lippe, who served as an adjutant to Joseph Goebbels, spoke out against letting Ellen be buried in Bückeburger Mausoleum next to her husband, because she was not of "Aryan origin".

As he had no children, Adolf was succeeded as head of the House of Schaumburg-Lippe by his younger brother Prince Wolrad.