Cornelis (Cees or Kees) Timmer (June 20, 1903 – January 24, 1978) was a Dutch artist, who worked as sculptor, graphic artist, monumental artist, wall painter, painter, draftsman, jeweler, and mosaicist. Born in Zaandam in 1903, Timmer settled in Rotterdam in 1923. He attended evening art classes at the Academie voor Beeldende Kunsten (now Willem de Kooning Academy, where Herman Mees taught painting, and David Bautz drawing. In 1928 he was awarded the Silver Academy Medal (de zilveren Academiemedaille).