Pierre-Narcisse, baron Guérin (13 May 1774 – 6 July 1833) was a French painter.
Guérin was born in Paris.
A pupil of Jean-Baptiste Regnault, he carried off one of the three grands prix offered in 1796, in consequence of the competition not having taken place since 1793. In 1799, his painting Marcus Sextus (Louvre) was exhibited at the Salon and excited wild enthusiasm. Part of this was due to the subject - a victim of Sulla's proscription returning to Rome to find his wife dead and his house in mourning - in which an allusion was found to the turmoil of the French Revolution.
Guérin on this occasion was publicly crowned by the president of the Institute, and went to Rome to study under Joseph-Benoît Suvée. In 1800, unable to remain in Rome on account of his health, he went to Naples, where he painted the Grave of Amyntas. In 1802 Guérin produced Phaedra and Hippolytus (Louvre); in 1810, after his return to Paris, he again achieved a great success with Andromache and Pyrrhus (Louvre); and in the same year also exhibited Cephalus and Aurora (Louvre) and Bonaparte and the Rebels of Cairo (Versailles). These paintings suited the popular taste of the First Empire, being highly melodramatic and pompously dignified.
The Restoration brought to Guérin fresh honours; he had received from the first consul in 1803 the cross of the Legion of Honour, and in 1815 Louis XVIII named to the Académie des Beaux-Arts. His style changed to accord with popular taste. In Aeneas Relating to Dido the Disasters of Troy (Louvre), Guérin adopted a more sensuous, picturesque style.