Ranulf II (also spelled Rannoux, Rannulf, Ramnulf, and Ranulph) (850 – 5 August 890) was Count of Poitou from 866 and Duke of Aquitaine from 887. On the death of Charles the Fat in 888, he styled himself King of Aquitaine and did so until 889 or his death, after which the title fell into abeyance.