Alfred Sisley (30 October 1839 – 29 January 1899) is an Impressionist landscape painter who was born and spends most of his life in France, but retains British citizenship.

He is the most consistent of the Impressionists in his dedication to painting landscape en plein air (i.e., outdoors).

He never deviates into figure painting and, unlike Renoir and Pissarro, never finds that Impressionism does not fulfill his artistic needs.

Among his important works are a series of paintings of the River Thames, mostly around Hampton, executed in 1874, and landscapes depicting places in or near Moret-sur-Loing.