The following highways are numbered 30:

• AH30 Asian Highway 30
• E30 European route E30

• Albany Highway (State Route 30, Western Australia)

• BR-030

• Alberta Highway 30 (defunct)
• British Columbia Highway 30
• Manitoba Highway 30
• Newfoundland and Labrador Route 30
• Cabot Trail, also known as Nova Scotia Trunk 30
• Ontario Highway 30 (former)
• Quebec Autoroute 30
• Saskatchewan Highway 30

• G30 Expressway

• I/30 Highway; Czech: Silnice I/30

• EO30 road

• NH 30

• N30 road (Ireland)

• Autostrada A30

• Japan National Route 30
• Seto-Chūō Expressway

• Dangjin–Yeongdeok Expressway
• National Route 30
• Gukjido 30

• New Zealand State Highway 30
  • New Zealand State Highway 30A

• British A30 (Penzance-London)

• Otoyol 30

• Highway M30 (Ukraine)

• E 30 road (United Arab Emirates)

• Interstate 30
• U.S. Route 30
  • U.S. Route 30N (disambiguation), several former sections
  • U.S. Route 30S (disambiguation), several former sections
• New England Route 30 (former)
• Alabama State Route 30
• Arizona State Route 30
• Arkansas Highway 30 (1926–1958) (former)
• California State Route 30 (former)
  • County Route J30 (California)
  • County Route S30 (California)
• Colorado State Highway 30
• Connecticut Route 30
• Delaware Route 30
• Florida State Road 30
  • Florida State Road 30E
• Georgia State Route 30
• Hawaii Route 30
• Illinois Route 30 (former)
• K-30 (Kansas highway)
• Kentucky Route 30
• Louisiana Highway 30
  • Louisiana State Route 30-E (former)
• Maryland Route 30
  • Maryland Route 30BC
  • Maryland Route 30BZ
  • Maryland Route 30C (former)
  • Maryland Route 30D (former)
• Massachusetts Route 30
• M-30 (Michigan highway)
• Minnesota State Highway 30
  • County Road 30 (Chisago County, Minnesota)
  • County Road 30 (Dakota County, Minnesota)
  • County Road 30 (Hennepin County, Minnesota)
  • County Road 30 (Ramsey County, Minnesota)
• Mississippi Highway 30
• Missouri Route 30
• Nebraska Highway 30 (former)
  • Nebraska Spur 30B
  • Nebraska Spur 30C
  • Nebraska Spur 30D
  • Nebraska Spur 30H
• Nevada State Route 30 (former)
• New Jersey Route 30 (former)
  • County Route 30 (Bergen County, New Jersey)
  • County Route 30 (Monmouth County, New Jersey)
  • County Route 30 (Ocean County, New Jersey)
• New Mexico State Road 30
• New York State Route 30
  • County Route 30 (Cattaraugus County, New York)
  • County Route 30 (Chenango County, New York)
  • County Route 30 (Delaware County, New York)
  • County Route 30 (Dutchess County, New York)
  • County Route 30 (Erie County, New York)
  • County Route 30 (Essex County, New York)
  • County Route 30 (Genesee County, New York)
  • County Route 30 (Montgomery County, New York)
  • County Route 30 (Otsego County, New York)
  • County Route 30 (Putnam County, New York)
  • County Route 30 (Rockland County, New York)
  • County Route 30 (Schenectady County, New York)
  • County Route 30 (Schoharie County, New York)
  • County Route 30 (Suffolk County, New York)
  • County Route 30 (Ulster County, New York)
  • County Route 30 (Washington County, New York)
  • County Route 30 (Westchester County, New York)
  • County Route 30 (Yates County, New York)
• North Carolina Highway 30
• North Dakota Highway 30
• Ohio State Route 30 (1923-1927) (former)
• Oklahoma State Highway 30
• South Carolina Highway 30
• South Dakota Highway 30
• Tennessee State Route 30
• Texas State Highway 30
  • Texas State Highway Spur 30
  • Farm to Market Road 30
  • Texas Park Road 30
• Utah State Route 30
• Vermont Route 30
• Virginia State Route 30
• Washington State Route 30 (former)
• Wisconsin Highway 30
• Wyoming Highway 30

Territories

• Puerto Rico Highway 30
• U.S. Virgin Islands Highway 30

• National Road 30 (Vietnam)

• List of A30 roads
• List of highways numbered 30A