 He was elected a Fellow of the Royal Society of Edinburgh in 1790, a Fellow of the Royal Society and a foreign member of the Royal Swedish Academy of Sciences in 1806.In 1808, Napoleon made Lagrange a Grand Officer of the Legion of Honour and a Count of the Empire.He was awarded the Grand Croix of the Ordre Impérial de la Réunion in 1813, a week before his death in Paris.