Frederick (Frits) Koolhoven (11 January 1886 – 1 July 1946) was an aircraft designer in Britain and his native Netherlands.

turned out many technically advanced designs, which attracted attention from all over the world but virtually no orders.

Koolhoven convinced several shareholders that the company would still have been viable if he had had complete control of the operations.

Frederick Koolhoven was convinced that the bombing had everything to do with his contribution as an aircraft designer in England during World War I.

For unknown reasons (possibly to avoid persecution for his work in the UK during World War I, or for illegal aircraft sales to the Spanish Republic) he became a very inactive member of the National Socialist Movement in the Netherlands (NSB).