Night Shift
- A barbershop quartet from southeastern Michigan.
- http://www.harmonize.com/NightShift/

NeXus Quartet
- A Denver Colorado based a cappella quartet that sings a variety of music, including barbershop, jazz, pop, gospel, and swing. They are also competitors in the Barbershop Harmony Society, SPEBSQSA.
- http://www.nexusqt.com/

Nightlife
- 1996 International Quartet Champions from Los Angeles, California.
- http://www.nightlifequartet.com/

Nightwatch
- Comedy quartet from Milwaukee, Wisconsin. Schedule, booking and contact information, a picture gallery and general background information.
- http://www.execpc.com/~hettig/Default.htm

Northland Gold
- A quartet from St. Paul, Minnesota that began as a way to demonstrate that barbershop administrators can sing and ring chords too.
- http://www.arneberg.com/bbshop/nlgold

Noise Boys
- Quartet from Stockholm,  Sweden formed by three baritones and one lead singer at the SNOBS' Fall Convention in Falun in 1995. 
- http://home.swipnet.se/vocal_vikings/noiseeng.htm