Frans Simon Hoos (Den Haag 1884 – Den Haag 1966) was a Dutch painter, watercolorist and draftsman. Hoos was self-taught as a painter. He painted landscapes, portraits, cityscapes and still lifes in the style of the Hague School. The influence of George Hendrik Breitner and Willem de Zwart is visible in his earlier work. Hoos spent a number of periods in Belgium and France, but mainly lived and worked in his hometown The Hague and Voorburg. In the 1950s he took part in an exchange program with French artists, in collaboration with the Pulchri Studio.