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Eruv (Hebrew: עירוב "mixture"), in Judaism, may refer to:
- Eruvin (Talmud), a tractate in Moed
- Eruv tavshilin, ("mixing of cooked dishes"), which permits cooking on a Friday Holiday to prepare for Shabbat.
- Eruv techumin, ("mixing of borders"), which permits travel beyond the city boundary ("techum") on Shabbat.