Tanis was the capital of the 21st and 22nd dynasties of ancient Egypt, and is now an archaeological temple site.
Tanis may also mean:
- Tanis Half-Elven, a character in the Dragonlance novels
- Tanis, Manche, a commune of the Manche département, in France
- Tanis, Wiltshire, a small village on the outskirts of Rowde in Wiltshire
- Tanis Diena, from Latvian mythology
- Tanis Ester, from the Jewish Fast of Esther
- Tanis, a character in an early episode of Star Trek: Voyager
- Tanis, an Earth-like planet in the 2009 movie Pandorum
- Tanis, a little girl mummy in Scooby-Doo and the Ghoul School