2D or 2-D may refer to:
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Look up 2d in Wiktionary, the free dictionary.
- Two-dimensional space
- Two-dimensional Euclidean space
- 2D geometric model
- 2D computer graphics
- 2-D (character), a member of the virtual band Gorillaz
- Index finger, the second digit (abbreviated 2D) of the hand
- Oflag II-D
- Stalag II-D
- Transcription factor II D
- Two Dickinson Street Co-op, a student dining cooperative at Princeton University
- 2D animation, or traditional animation
- Two-dimensional correlation analysis
- Nintendo 2DS, the third iteration in the Nintendo 3DS line, released in 2013
- New Nintendo 2DS XL, the sixth iteration in the Nintendo 3DS line, released in 2017 and a larger version of the 2DS
- 2degrees, New Zealand telecommunications provider
- Twopence (British pre-decimal coin), routinely abbreviated 2d.