Prince Napoléon Joseph Charles Paul Bonaparte, usually called Napoléon-Jérôme Bonaparte or Jérôme Bonaparte, was the second son of Jérôme, King of Westphalia, youngest brother of Napoleon I, and his second wife Catharina of Württemberg. Following the death of his nephew Louis-Napoléon, Prince Imperial in 1879, he claimed headship of the House of Bonaparte until his death in 1891. An outspoken liberal however, he was passed over as heir in his cousin's final will, instead choosing his elder son Victor, who was favored by most Bonapartists. From the 1880s he was one of the stronger supporters of General Georges Boulanger, together with other monarchist forces.

Bonapartism is the political ideology supervening from Napoleon Bonaparte and his followers and successors. The term was used to refer to people who hoped to restore the House of Bonaparte and its style of government. In this sense, a Bonapartiste was a person who either actively participated in or advocated for conservative, monarchist, and imperial political factions in 19th-century France.