The Third of May 1808 in Madrid is a painting completed in 1814 by the Spanish painter Francisco Goya, now in the Museo del Prado, Madrid. In the work, Goya sought to commemorate Spanish resistance to Napoleon's armies during the occupation of 1808 in the Peninsular War. Along with its companion piece of the same size, The Second of May 1808, it was commissioned by the provisional government of Spain at Goya's own suggestion shortly after the ousting of the French occupation and the restoration of King Ferdinand VII.

Francisco José de Goya y Lucientes was a Spanish romantic painter and printmaker. He is considered the most important Spanish artist of the late 18th and early 19th centuries. His paintings, drawings, and engravings reflected contemporary historical upheavals and influenced important 19th- and 20th-century painters. Goya is often referred to as the last of the Old Masters and the first of the moderns.