Luff or luffing may refer to:
- Luffing, when a sailing sheet is eased so far past trim that airflow over the surface is disrupted
- The leading edge of a sail
- Luffing crane, a type of crane where the jib, rather than being fixed, can be raised and lowered
- Luff, coined by Woody Allen in Annie Hall, is a term of endearment and is chatspeak for love
- Red
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