Mauna or Mouna may refer to:
- Mauna (moth), genus of moths in the family Geometridae
- Mauna (silence), silence in Hindu philosophy
- Maun Vrata, term for a vow of silence in India
- Mauna, Käbschütztal, village in Käbschütztal, Germany
- A Hawaiian word for mountain, used in the following Hawaiian volcano names:
- Mauna Loa, on Hawai'i
- Mauna Kea, on Hawai'i
- Mauna Ulu, cinder cone of Kīlauea, on Hawai'i
- Mauna Iki, cinder cone of Kīlauea, on Hawai'i
- Mauna Haleakalā, on Maui
- Mauna Hina, cinder cone of Haleakalā