Leonetto Cappiello (1875–1942) was an Italian and French poster art designer and painter, primarily known for his work in Paris. He is often referred to as "the father of modern advertising" due to his innovative approach to poster design.

Cappiello was born on April 9, 1875, in Livorno, Italy. He later moved to Paris, which was the centre of the art world at the time. Cappiello's unique style revolutionised the field of advertising by incorporating bold colours, simplified forms, and humorous or striking imagery. His posters captured the attention of the public and effectively promoted various products, making him a sought-after designer during his time.

Throughout his career, Cappiello created a significant number of iconic posters for various industries, including food and beverages, entertainment, and travel. His distinct style and ability to convey messages in a simple yet compelling manner made him one of the most influential poster artists of his era.