Charles Auguste Mengin (5 July 1853 - 3 April 1933), was a French academic painter and sculptor.
He was born in Paris, France, , and was educated by Gecker and Alexandre Cabanel. Mengin first exhibited at the Paris Salon together with his twin brother, Paul Eugène Mengin, in 1876 and continued his exhibitions at Salon des Artistes Français until 1927. He is known for his painting of Sappho, now in the collection of the Manchester Art Gallery. He died in Paris.