Nonce may refer to:
- Cryptographic nonce, a number or bit string used only once, in security engineering
- Nonce (slang), a British and Australian slang term for a sex offender, usually a child sexual abuser
- Nonce, time being: the present occasion; "for the nonce"
- Nonce word, a word used to meet a need that is not expected to recur
- The Nonce, American rap duo
- Nonce orders, an architectural term