D3D may refer to:
- DIII-D (tokamak) (pronounced 'D3D'), a tokamak located at San Diego, California
- Direct3D, Microsoft's graphics rendering scheme
- Dolby 3D
- Duke Nukem 3D or Duke3d, a first person shooter video game from 1996
- China Railways HXD3D, a type of electric locomotive in China
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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