Luigi Loir was a French painter, illustrator and lithographer.
Luigi Loir was born in Goritz, Austria. He was the son of Tancrède Loir François and Thérèse Leban, his wife, respectively valet and housekeeper of the French royal family in exile in Austria. Installed in the duchy of Parma in 1847, Luigi Loir studied at the school of Fine Arts of Parma in 1853. His first known painting is Paysage à Villiers-sur Seine (1865), painted two years after his return to Paris. He was primarily a landscape painter. He also became known for his ceiling paintings and worked with Jean Pastelot (1820–1870).

He realized some drawings for the biscuits brand LU and participated in the battles of Le Bourget during the Franco-Prussian War.

Loir was made a chevalier of the Légion d'honneur in 1898 He died in Paris in 1916.