N11 or N-11 may refer to:
- HMS Thorn (N11)
- N11, a postcode district in the N postcode area of North London
- N11 code, special three-digit telephone numbers (such as 911) in the North American Numbering Plan
- N11, project code name of the Intel i860 XP model VLIW RISC microprocessor
- Next Eleven, a group of emerging economies proposed by Goldman Sachs
- London Buses route N11
- N11 road (France)
- N11 road (Ireland)
- N11 road (South Africa), a road connecting Newcastle, Polokwane and the Botswana border
- Interstitial nephritis ICD-10 code
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