This is a list of collisions between exoplanets or planetesimals observed in extrasolar systems.
These collisions are more common in young systems and are an important part in the growth of especially terrestrial planets from so-called planetary embryos.
Co-moving stellar or substellar companions can trigger such collisions at an old age, creating old EDDs.
[2][3] This list does not include planetary bodies being accreted by white dwarfs, for this refer to the List of exoplanets and planetary debris around white dwarfs.
This list contains systems with individual collision events that were directly observed.