The 1181 papal election followed the death of Pope Alexander III and resulted in the election of Pope Lucius III. This was the first papal election celebrated in accordance with the decree Licet de evitanda discordia, promulgated in the Third Lateran Council in 1179, which established that the pope is elected by a majority of two thirds votes.

Pope Lucius III, born Ubaldo Allucingoli, reigned from 1 September 1181 to his death in 1185. Born of an aristocratic family of Lucca, prior to being elected pope, he had a long career as a papal diplomat. His papacy was marked by conflicts with Holy Roman Emperor Frederick I, his exile from Rome and the initial preparations for the Third Crusade.