4D
4D or 4-D may refer to:
- 4-dimensional spacetime: three-dimensional space of length, width, and height, plus time
 - Four-dimensional space
 
Computers and photography
    
- 4D (software), a complete programming environment including database and web server
 - 4D BIM, a term used in computer aided design
 - 4D printing
 - Cinema 4D, a commercial cross platform 3D graphics application
 - SGI IRIS 4D, a line of workstations from Silicon Graphics
 - 4D, a photo print size for digital cameras
 
Arts and entertainment
    
- 4D (album), a 2010 album by Matthew Shipp
 - "4-D" (The X-Files), an episode of The X-Files
 - 4D Audio Recording system, an audio recording system developed by Deutsche Grammophon
 - 4D film, a high technology film experience augmented with physical or environmental effects
 - 4DTV, a satellite TV broadcasting technology from Motorola
 - 4DX, a 4D film format
 - "4D", a song by Grand Mixer DXT and Bill Laswell from Aftermathematics (2003)
 - "4D", a song by Northlane from Alien (2019)
 - 4D, the production code for the 1975 Doctor Who serial Revenge of the Cybermen
 
Other
    
- Class 4-D, a classification of the Selective Service System
 - 4-D (psychedelic), a psychedelic drug
 - 4D (train) in Melbourne, Australia
 - 4-Digits, a lottery in Malaysia and Singapore
 - Air Sinai (IATA: 4D)
 - Ring finger, the fourth digit (abbreviated 4D) of the hand
 - Potez 4D, a four-cylinder aircraft engine
 
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