The Vitruvian Man or simply L'Uomo Vitruviano, is a drawing made by the Italian polymath Leonardo Da Vinci around 1490. The drawing, which is in ink on paper, depicts a man in two superimposed positions with his arms and legs apart and inscribed in a circle and square. The drawing and text are sometimes called the Canon of Proportions or Proportions of Man.

The drawing is based on the correlations of ideal human body proportions with geometry described by the ancient Roman architect Vitruvius in Book III of his treatise De architectura. Vitruvius described the human figure as being the principal source of proportion among the classical orders of architecture. Vitruvius determined that the ideal body should be eight heads high.