Alexis Simon Belle (January 12, 1674 – November 21, 1734) is a French portrait painter, known for his portraits of the French and Jacobite nobility.

As a portrait artist, Belle's style follows that of his master François de Troy, Hyacinthe Rigaud, and Nicolas de Largillière.

He is the master of the painter Jacques-André-Joseph-Camelot Aved (1702–1766).