Jacob Adriaan Kalff (27 April 1869 – 13 January 1935) was a Dutch businessperson and politician.

He was director of the Nederlandse Spoorwegen and served as Minister of Transport and Water Management.

[1] After studying at the Polytechnic School in Delft he worked at the Hollandsche IJzeren Spoorweg-Maatschappij.

Kalff was blamed he had given out a certificate of airworthiness for the Uiver [nl] aircraft with fewer demands than desired due to the "major interests of KLM" and he should not have issued a passenger permit.

The six demands requested by the Kalff in return for giving out the certificate were not implemented by KLM.