Tanausu (also Tanausú and Atanausu) (died 1493) was the Guanche ruler of Aceró, on the island of La Palma (known to the original population as Benahoare), whose defeat by the Castilians marked the final conquest of that island.
He was the last king of La Palma to submit himself to the Castilian forces led by Alonso Fernández de Lugo.
He was convinced to come out on the pass known as Adamacansis, and was ambushed on the spot now known as El Riachuelo, near present-day La Cumbrecita.
In defiance, Tanausu is said to have refused to eat during the voyage to Spain, and he died without seeing land again.
The scholar Harald Braem wrote a book called Tanausu, König der Guanchen ("Tanausu, King of the Guanches", available in German and Spanish, editorial Verena Zech, Tenerife 2005).