Jacques de Kadt (30 July 1897, Oss – 16 April 1988, Santpoort) was a prominent and often controversial 20th Century Dutch political thinker, politician and man of letters. Born into a liberal Jewish family, he was the youngest son of a factory manager, Roelof de Kadt, and his wife Bertha Koppens. Author of numerous books and articles, his reputation was established by his book Het fascisme en de nieuwe vrijheid (Fascism and the New Freedom) which was published in 1939, shortly before the outbreak of the Second World War.