Alberto Giacomo Vianelli (June 5, 1841 in Cava de' Tirreni, Naples – 1927) was an Italian painter.

He trained under his father, the painter Achille Vianelli, and his uncle the Cavalier Giacinto Gigante, then moved to Paris, where in 1875 he studied figure painting under Gustave Boulanger and Jules Lefebvre.

His first paintings, two small landscapes, were exhibited in the 1877 Salon di Paris: Fundarà ad Ischia and Avanzi del teatro romano a Benevento.

Among his works: Cinq-cent (exhibited at Paris, London, and Brussels); Cage dorée; Triste nouvelle; Dolce far niente; a portrait of Lady Erskine; Un giuri (exhibited at the 1885 Salon, then at Amiens where it won a first class medal.

At 1881 Salon, he displayed: Solo, a large half-figure; Louis XV; and the Interno Normanno.