1E is a UK software company.
1E or 1-E may also refer to:
- 1st meridian east, a longitude coordinate
- ISS 1E
- Astra 1E, a communications satellite owned and operated by SES, and launched in 1995
- California Proposition 1E (2009), a defeated California ballot proposition
- 1E, UIC classification of the 2-10-0 train arrangement*1E, a designator of celestial objects discovered via Einstein Observatory
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