| Yahwehism | Adherents to Hebrew Bible / Mosaic law; Sabbath keeping, diet, festivals, sacred name. |
| YHWH | ("Yahweh") The 'Tetragrammaton' in the Tanach, the sacred name of God meaning 'I am.' It is so holy that it was never uttered and 'adonai' (LORD) was substituted. |
| Yin / Yang | Polarity of reality in Chinese philosophy: Yang is masculine, dynamic, bright, and good.; Yin is feminine, passive, dark, and bad; produce the elements and the cycle of seasons. |
| Yoga | Discipline designed to induce union with Brahma. |
| Yogi | Hindu holy man who has reached enlightenment through Yogic practices. |
| Yom Kippur | ('Day of Atonement') Jewish day of fasting and repentance. |
| Yugas | ('ages') Hindu view of eternity as constant cycle of creation, maintenance and devolution; |
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