Diederik Jekel (born 22 June 1984) is a Dutch science journalist and television presenter. He regularly appeared in the early-evening talk show De Wereld Draait Door to discuss science-related topics. In 2013, he appeared as host, alongside Matthijs van Nieuwkerk and Isolde Hallensleben, in the spin-off De wereld leert door in which scientists are interviewed about their research. Between 2015 and 2018, he appeared in the television game show Professor Nicolai & Dr. Beckand, presented by Ruben Nicolai and Tijl Beckand, to explain scientific concepts and experiments. In 2016, he won the National IQ Test with an IQ of 137.