Mad as a hatter (disambiguation)
Mad as a hatter is an English-language stock phrase.
Mad as a hatter also may refer to:
- "...Mad as a hatter...", segment of medical mnemonic re anticholinergic toxidrome, for diagnosing some poisonings
- "Mad as a Hatter", television episode in Batman: The Animated Series
- Mad As A Hatter, EP by Def Wish Cast