Nail or Nails may refer to:
In biology
- Nail (anatomy), toughened protective protein-keratin (known as alpha-keratin, also found in hair) at the end of an animal digit
- Nail (beak), a plate of hard horny tissue at the tip of some bird beaks
Objects
- Nail (fastener), the pin-shaped fastener used in engineering, woodworking and construction
- Nail (relic), used in the crucifixion of Christ
- The Exchange nails, bronze tables outside of The Exchange, Bristol
Arts and entertainment
- Nails (band), a powerviolence band
- The Nails, a 1980s new wave band from Colorado and then New York
- Nine Inch Nails, an industrial rock band from Ohio
- Nail (album), an album by Scraping Foetus Off The Wheel
- Nail, a Namekian in Dragon Ball
- JLA: The Nail, a three-issue comic book miniseries
People
- Nail (given name), a list of people with the given name Nail
- Nail (surname), a list of people with the surname Nail or Nails
- Lenny Dykstra, former Major League Baseball outfielder nicknamed "Nails"
Businesses
- Nail Brewing, a Western Australian brewery
- Nail Communications, an ad agency
- Nails Inc., an English nail care chain
Other uses
- Nail (unit), an archaic multiplier equal to one sixteenth of a base unit
- Nail, Arkansas, a community in the United States
- Nail, project name for the Heirloom Project mailx Unix computer utility
- Neurotics Anonymous, abbreviated NAIL to avoid confusion with Narcotics Anonymous (NA)