List of highways numbered 99

International

 * European route E99

Australia

 * Springbrook Road, Queensland

Canada

 * BC-99.svg British Columbia Highway 99
 * Ontario 99.svg Ontario Highway 99 (former)
 * Saskatchewan Highway 99 (jct).svg Saskatchewan Highway 99

China

 * China_Expwy_G99_sign_with_name.svg G99 Expressway

India

 * NH99-IN.svg National Highway 99 (India)

Iran

 * Iran First Level Road 99.png Road 99

Israel

 * ISR-HW-99.svg Highway 99 (Israel)

New Zealand

 * State Highway 99 NZ.svg New Zealand State Highway 99

Poland

 * DK99-PL.svg National road 99 (Poland) (former; 1986–2000)

United States

 * I-99.svg Interstate 99
 * I-99 (Future).svg Interstate 99 (Delaware-North Carolina) (proposed)
 * US 99 (1961).svg U.S. Route 99 (former)
 * US 99T (1961).svg U.S. Route 99T (former)
 * Alabama 99.svg Alabama State Route 99
 * Arizona 99.svg Arizona State Route 99
 * Arkansas 99.svg Arkansas Highway 99 (former)
 * California 99.svg California State Route 99
 * Connecticut Highway 99.svg Connecticut Route 99
 * Florida 99.svg Florida State Road 99 (former)
 * Escambia County Road 99 FL.svg County Road 99 (Escambia County, Florida)
 * Escambia County Road 99A FL.svg County Road 99A (Escambia County, Florida)
 * Georgia 99.svg Georgia State Route 99
 * HI-99.svg Hawaii Route 99
 * ID-99.svg Idaho State Highway 99
 * Illinois 99.svg Illinois Route 99
 * Iowa 99.svg Iowa Highway 99 (former)
 * Des Moines County Route 99 IA.svg County Road 99 (Des Moines County, Iowa)
 * CR 99 jct.svg County Road 99 (Louisa County, Iowa)
 * K-99.svg K-99 (Kansas highway)
 * Elongated circle 99.svg Kentucky Route 99
 * Louisiana 99.svg Louisiana Highway 99
 * MA Route 99.svg Maine State Route 99
 * MD Route 99.svg Maryland Route 99
 * MA Route 99.svg Massachusetts Route 99
 * M-99.svg M-99 (Michigan highway)
 * MN-99.svg Minnesota State Highway 99
 * MO-99.svg Missouri Route 99
 * Missouri Route 99 (1929) (former)
 * N-99.svg Nebraska Highway 99
 * Bergen County 99.svg County Route 99 (Bergen County, New Jersey)
 * New Mexico 99.svg New Mexico State Road 99 (former)
 * NY-99.svg New York State Route 99 (former)
 * Dutchess County Route 99 NY.svg County Route 99 (Dutchess County, New York)
 * CR 99 jct.svg County Route 99 (Herkimer County, New York)
 * CR 99 jct.svg County Route 99 (Madison County, New York)
 * CR 99 jct.svg County Route 99 (Montgomery County, New York)
 * CR 99 jct.svg County Route 99 (Onondaga County, New York)
 * CR 99 jct.svg County Route 99 (Orleans County, New York)
 * Saratoga County Route 99 NY.svg County Route 99 (Saratoga County, New York)
 * CR 99 jct.svg County Route 99 (Schenectady County, New York)
 * CR 99 jct.svg County Route 99 (Steuben County, New York)
 * Suffolk County Route 99 NY.svg County Route 99 (Suffolk County, New York)
 * CR 99 jct.svg County Route 99 (Westchester County, New York)
 * NC 99.svg North Carolina Highway 99
 * OH-99.svg Ohio State Route 99
 * Oklahoma State Highway 99.svg Oklahoma State Highway 99
 * Oklahoma State Highway 99A.svg Oklahoma State Highway 99A
 * OR 99.svg Oregon Route 99
 * PA-99.svg Pennsylvania Route 99
 * Rhode Island 99.svg Rhode Island Route 99
 * South Carolina 99.svg South Carolina Highway 99
 * Tennessee 99.svg Tennessee State Route 99
 * Texas 99.svg Texas State Highway 99
 * Texas Spur 99.svg Texas State Highway Spur 99 (1940–1966) (former)
 * Texas Spur 99.svg Texas State Highway Spur 99 (1981–1984) (former)
 * Texas FM 99.svg Farm to Market Road 99
 * Utah SR 99.svg Utah State Route 99
 * Virginia 99.svg Virginia State Route 99
 * WA-99.svg Washington State Route 99
 * WA-99T.svg Washington State Route 99T (former)
 * WV-99.svg West Virginia Route 99
 * WIS 99.svg Wisconsin Highway 99 (former)