Free space may refer to:
- A perfect vacuum, that is a space free of all matter
- In electrical engineering, free space means air (as opposed to a material, transmission line, fiber-optic cable, etc.):
- Free-space optical communication is communication by shining light through air
- Free-space path loss, the spreading-out of light as it travels through 3D space
- Free-space display is a 3D display projected into the air, often with the help of mist
- Autonomous free space, community centers in which non-authoritarians enact principles of mutual aid
- Social centre the free shared space in a community
- Descent: FreeSpace – The Great War, a space combat simulation computer game
- The area of a data storage device (for example, a computer disk drive) that is still available for more data storage
- Motion planning § Free space, the subset of a configuration space where a robot will not collide with obstacles
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