The Age of Innocence is an oil-on-canvas painting by Sir Joshua Reynolds, created in either 1785 or 1788 and measuring 765 x 638 mm.

The sitter is unknown, but possibly, was Reynolds's great-niece, Theophila Gwatkin (who was three in 1785 and six in 1788), or Lady Anne Spencer (1773–1865), the youngest daughter of the 4th Duke of Marlborough, who would have been twelve in 1785 and fifteen in 1788.

The painting was presented to the National Gallery in 1847 by Robert Vernon and has hung in the Tate Britain since 1951.

The Age of Innocence became a favourite of the public and, according to Martin Postle, “the commercial face of childhood”.

The catchy name given to the painting after Reynolds' death originated with Joseph Grozer in 1794, when he used that title for his stipple engraving of the work.