LEF
LEF may refer to:
- LEF (Journal), a journal of aesthetics published in the Soviet Union in the 1920s.
- Library Exchange Format in Electronic design automation domain.
- Life Extension Foundation, a non-profit organization dedicated to funding anti-aging research, providing high-quality nutrient supplements, publishing timely reports on advances and legal issues in nutrition and longevity-related fields, and lobbying for prolongevity issues.
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