Nah, nah, or NaH may refer to:
- Nehbandan or Nah, a city in South Khorasan Province, Iran
- Sodium hydride, whose chemical formula is NaH
- The language code nah, which stands for Nahuatl
- A variation of "no", as in "yes and no", common especially in Australian English
- Ix Ek' Naah, a Mayan queen