Giuseppe Marco Fieschi (13 December 1790 – 19 February 1836) was a Corsican mass murderer, and the chief conspirator in an attempted assassination of King Louis-Philippe of France on 28 July 1835.

[Note 1] According to Harsin, Fieschi escaped execution and was deported to France, where he was eventually sentenced in 1816 to 10 years in jail for the theft of a steer.

Shortly after the July Revolution, Fieschi moved to Paris, calling himself a political prisoner, a deceit that allowed for unchallenged movement.

Louis-Philippe was passing along the Boulevard du Temple, which connected Place de la République to the Bastille.

Eighteen people were killed at the scene, or later died from their wounds, including Lieutenant Colonel Rieussec together with eight other officers of the 8th Legion, Marshal Mortier, and Colonel Raffet, General Girard, Captain Villate, General La Chasse de Vérigny and Alexandre Labrouste [fr], father of notable architect Henri Labrouste.

It was only after some days that his true identity was discovered when he was recognized by the Inspector General of Prisons, Olivier Dufresne, while he was being held in the Conciergerie.

No fewer than seven plots against the life of Louis Philippe had been discovered by the police within the year, and apologists were not wanting in the revolutionary press for the crime of Fieschi.

[3] In the immediate aftermath of the attack, a number of newspaper editors and writers were arrested, including Armand Carrel, but they were soon released.

Horace Vernet, the King's painter, was ordered to make a drawing of the assassination attempt, which Eugene Louis Lami executed.

A copy of this is preserved in England at Norwich Castle; the mask shows evidence of the facial and head injuries he received.

[24] A postmortem examination of Fieschi's brain was carried out by the anatomists Louis Pierre Gratiolet and François Leuret, to determine if it exhibited features that might explain his behavior.

Giuseppe Fieschi was honored in a religious service at a Moscow church at the prompting of Soviet General Andrei Grigorevich Kostikov [ru], the inventor of the Katyusha rocket launcher.

[26] Fieschi's volley gun, which became known as the Machine infernale, is now part of the collection of the Musée des Archives Nationales in Paris.