List of highways numbered 84
- A84 (disambiguation)
- AH84
- Arizona State Route 84
- Arizona State Route 84A
- Arkansas Highway 84
- California State Route 84
- Colorado State Highway 84 (1923-1968)
- County Road 84 (Anoka County, Minnesota)
- County Route 84 (Bergen County, New Jersey)
- County Route 84 (Broome County, New York)
- County Route 84 (Chautauqua County, New York)
- County Route 84 (Chemung County, New York)
- County Route 84 (Dutchess County, New York)
- County Route 84 (Erie County, New York)
- County Route 84 (Essex County, New York)
- County Route 84 (Greene County, New York)
- County Route 84 (Jefferson County, New York)
- County Route 84 (Livingston County, New York)
- County Route 84 (Madison County, New York)
- County Route 84 (Monroe County, New York)
- County Route 84 (Onondaga County, New York)
- County Route 84 (Rensselaer County, New York)
- County Route 84 (Rockland County, New York)
- County Route 84 (Schenectady County, New York)
- County Route 84 (Suffolk County, New York)
- European route E84
- Farm to Market Road 84
- Florida State Road 84
- Georgia State Route 84
- Golden Highway
- Gukjido 84
- Illinois Route 84
- Interstate 84 (Oregon–Utah)
- Interstate 84 (Pennsylvania–Massachusetts)
- K-84 (Kansas highway)
- Kentucky Route 84
- M-84 (Michigan highway)
- Maryland Route 84
- Minnesota State Highway 84
- Missouri Route 84
- Montana Highway 84
- Nebraska Highway 84
- Nevada State Route 84
- New Hampshire Route 84
- New Jersey Route 84
- New York State Route 84
- New Zealand State Highway 84
- North Carolina Highway 84
- Ohio State Route 84
- Oklahoma State Highway 84
- Pennsylvania Route 84
- Rhode Island Route 84
- Road 84 (Iran)
- Tennessee State Route 84
- Texas State Highway 84
- Texas State Highway Loop 84
- Texas State Highway Spur 84
- U.S. Route 84
- Urban Road 84
- Utah State Route 84 (1935-1977)
- Virginia State Route 84
- West Virginia Route 84
- Wills Developmental Road
- Wisconsin Highway 84
