Abstract: A hybrid plug connector with modular electrical and light waveguide plug connections includes a tub-shaped pin connector housing and a socket connector housing, which can be plugged into one another in overlapping fashion. At least one socket module having jack contacts arranged in a predetermined grid, as well as at least one light waveguide module, which contains at least one single-mode fiber are insertable into the socket connector housing. In order to ensure a modular and variable construction of the mixed plugging system, the modules are inserted into an opening on one side in the socket connector housing and have equal measurements of separation with their outer dimensions. The pin connector housing is provided with plug pins in the tub base to coact with the jack contacts of the socket connectors and also has a light guide countermodule to connect with the optical fibers of the light waveguide module.