Greenfoot is an integrated development environment using Java or Stride designed primarily for educational purposes at the high school and undergraduate level. It allows easy development of two-dimensional graphical applications, such as simulations and interactive games.

Greenfoot is being developed and maintained at King's College London, with support from Oracle. It is free software, released under the GPL license. Greenfoot is available for Windows, macOS, Linux, Solaris, and any recent JVM.