List of highways numbered 321

Template:SHORTDESC: The following highways are numbered 321:

Canada

• Nova Scotia Route 321
• Saskatchewan Highway 321

China

• Error creating thumbnail: China National Highway 321

Costa Rica

• File:CR RNT 321.svg National Route 321

Cuba

• File:1–321 Cuba.png Cuatro Caminos–Arroyo de Agua Road (1–321)
• File:2–321 Cuba.png Las Minas–Comunidad Pedro Pi Road (2–321)
• File:4–321 Cuba.png Santa Clara–Caibarién Road (4–321)

Japan

• File:Japanese National Route Sign 0321.svg Japan National Route 321

United States

• File:US 321.svg U.S. Highway 321
• File:Arkansas 321.svg Arkansas Highway 321
  • File:Arkansas 321S.svg Arkansas Highway 321 Spur
• File:Georgia 321.svg Georgia State Route 321 (former)
• File:Elongated circle 321.svg Kentucky Route 321
• File:Louisiana 321.svg Louisiana Highway 321
• File:Ellipse sign 321.svg Mississippi Highway 321
• File:Nevada 321.svg Nevada State Route 321
• File:New Mexico 321.svg New Mexico State Road 321
• New York:
  • File:NY-321.svg New York State Route 321
  • File:Erie County 321 NY.svg County Route 321 (Erie County, New York)
• File:NC 321.svg North Carolina Highway 321 (former)
• File:OH-321.svg Ohio State Route 321
• File:PA-321.svg Pennsylvania Route 321
• File:Ellipse sign 321.svg Puerto Rico Highway 321
• File:Secondary Tennessee 321.svg Tennessee State Route 321
• Texas:
  • File:Texas 321.svg Texas State Highway 321
  • File:Texas Loop 321.svg Texas State Highway Loop 321
  • File:Texas FM 321.svg Farm to Market Road 321
• File:Virginia 321.png Virginia State Route 321
  • Virginia State Route 321 (former)
• File:WY-321.svg Wyoming Highway 321

Preceded by 320

Lists of highways 321

Succeeded by 322