Léon Auguste Adolphe Belly (1827–1877) was a French landscape painter.

He studied under Troyon, and in 1849 visited Barbizon where he came under the influence of Théodore Rousseau.

In 1853 he made his debut at the Paris Salon, exhibiting four landscapes of Nablus and Beirut, and of the shores of the Dead Sea, which attracted critical acclaim.

In 1855–6 he visited Egypt, travelling up the Nile in the company of another painter, Edouard Imer.

A second trip to Egypt in 1856 was largely spent making studies for his painting Pilgrims going to Mecca, now in the Musée d'Orsay.