A level editor (also known as a map, campaign or scenario editor) is a software used to design levels, maps, campaigns, etc. and virtual worlds for a video game. An individual involved with the creation of game levels is a level designer or mapper.

In some cases, the creator of a video game releases an official level editor for the game, but other times the community of fans step in to fill the void. The level editor can be integrated into the game; for example, a track editor for a racing game. Other times (and most often), the editor is a separate application, as are most fan-released level editors.