Nack the Weasel may refer to:
- Fang the Sniper, the character from the Sonic the Hedgehog series video games.
- Nack the Weasel (Archie), the character from the Sonic the Hedgehog comic series and its spin-off published by Archie Comics.
- Nack the Weasel (Dark Mobius), the version of Nack from Dark Mobius.
- Nack the Weasel (Sonic the Comic), the character from the Sonic the Comic series published by Fleetway Editions.
- Nack the Weasel (boss), the boss in Sonic the Hedgehog Triple Trouble.
- Fang (item), an item that appears in Tails Adventure.
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