Jean-Pierre-Frédéric Barrois was a French painter and miniaturist active in the first half of the 19th century. Born in Paris in 1786, he received a classical academic training at the École des Beaux-Arts under Louis Hersent and Jean-François Fontallard. He exhibited regularly at the Paris Salon from 1806 to 1841, and his works were shown at the Musée Napoléon (1812) and the Musée Royal (Louvre, 1817). In 1819, he was awarded a first-class medal at the Salon. Barrois worked both in oil and in miniature, achieving recognition in portrait painting in both formats. While his miniatures on ivory are noted for their refinement and precision, he was equally a skilled painter of full-scale academic portraits, trained in the tradition of Hersent, combining the structural rigor of Neoclassicism with the emerging sensitivity of early Romanticism. His oil portraits are characterized by a precise construction of form, a careful modelling of light and shadow, and a restrained but perceptible psychological presence. His treatment of materials reflects a miniaturist’s discipline, with particular attention to the rendering of skin tones and fabrics through layered technique. Backgrounds are often neutral, focusing attention on the sitter, occasionally complemented by discreet interior elements indicating social status. His known works include Portrait of a Young Dragoon Officer (1817), Officer of the 14th Infantry Regiment (1816), Portrait of Delphine d’Andelarre de Gallois (1816), and Portrait of Madame Hubert (1836). Barrois also executed religious commissions in the Île-de-France region. He died in Meaux in 1841.