The 9th International Workshop on Planetary, Solar and Heliospheric Radio Emissions (PRE 9) deals with the most recent developments in the study of non-thermal radio emissions from the Sun, the radio planets, the heliosphere, and from extrasolar sources like exoplanets or brown dwarfs. Special emphasis is put on current and future spacecraft missions (Juno, Solar Orbiter, JUICE), but also new developments in ground-based radio telescopic observations (e.g. with LOFAR) will be matters of discussion.