Napoléon Joseph Charles Paul Bonaparte, Prince Français, Count de Meudon, Count di Moncalieri ad personam, 3rd Prince von Montfort (commonly known as Prince Napoléon and occasionally as Prince Jérôme Napoléon; 9 September 1822 – 17 March 1891) was the second son of Jérôme Bonaparte, king of Westphalia, by his wife Princess Catherine of Württemberg. He soon rendered himself popular by playing on his family ties to Napoleon I. After the French revolution of 1848 he was elected to the National Assembly of France as a representative of Corsica.

Born at Trieste in the Austrian Empire (today Italy), and known as "Prince Napoléon", "Prince Jérôme Napoléon, or by the sobriquet of "Plon-Plon", he was a close advisor to his first cousin, Napoleon III of France, and in particular was seen as a leading advocate of French intervention in Italy on behalf of Camillo di Cavour and the Italian nationalists.

An anti-clerical liberal, he led that faction at court and tried to influence the Emperor to anti-clerical policies, against the contrary influence of the Emperor's wife, the Empress Eugenie, a devout Catholic and a conservative, and the patroness of those who wanted French troops to protect the Pope's sovereignty in Rome. The Emperor was to navigate between the two influences throughout his reign.

When his cousin became President in 1848, Napoleon was appointed Minister Plenipotentiary to Spain. He later served in a military capacity as general of a division in the Crimean War, as Governor of Algeria, and as a corps commander in the French Army of Italy in 1859. His curious nickname, "Plon-Plon", derives from his pronunciation of his name when he was a child, while the nickname "Craint-Plomb" ("Afraid-of-Lead") was given to him by the army due to his absence from the Battle of Solferino.

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