N11 or N-11 may refer to:

• N11 (South Africa)
• N11 highway, Philippines
• N11 motorway (Netherlands)
• N11 road (Ghana)
• N11 road (Ireland)
• Nebraska Highway 11, United States
• Route nationale 11, France

• N11 (emission nebula)
• HMS Thorn (N11), a submarine of the Royal Navy
• Intel i860 XP, a microprocessor
• Interstitial nephritis
• LNER Class N11, a class of British steam locomotives
• London Buses route N11
• N11 code, special telephone numbers in the North American Numbering Plan
• Next eleven, a group of emerging economies proposed by Goldman Sachs
• Nieuport 11, a French World War I fighter
• Nissan Pulsar (N11), a Japanese car
• Nitrogen-11, an isotope of nitrogen
• North Springs station, a MARTA station in Sandy Springs, Georgia
• N11, a postcode district in the N postcode area of North London