Wubbo Johannes Ockels (born March 28, 1946) is a Dutch physicist and a former astronaut of the European Space Agency (ESA). In 1985 he participated in a flight on a space shuttle (STS-61-A), making him the first Dutch citizen in space. He was not the first Dutch-born astronaut, as he is preceded by the naturalised American Lodewijk van den Berg, who flew on STS-51-B. Ockels is currently professor of Aerospace for Sustainable Engineering and Technology at the Delft University of Technology.