Route 20, or Highway 20, may refer to:
Sturt Highway (NSW/VIC/SA)
Yarra Bank Highway 
Carretera Granma (6–20)
I/20 Highway; Czech: Silnice I/20 
New Zealand State Highway 20 (Auckland Southwestern Motorway) 
Interstate 20 
U.S. Route 20 
U.S. Route 20N (former)
U.S. Route 20S (former)
New England Route 20 (former)
Alabama State Route 20 
Arkansas Highway 20 
California State Route 20 
Connecticut Route 20 
Delaware Route 20 
Florida State Road 20 
Georgia State Route 20 Georgia State Route 20 (former) Georgia State Route 20 (former)
Illinois Route 20 (former)
K-20 (Kansas highway) 
Kentucky Route 20 
Louisiana Highway 20 
Maryland Route 20 
Massachusetts Route 20 
M-20 (Michigan highway) 
Minnesota State Highway 20 
Missouri Route 20 
Nevada State Route 20 (former) New Jersey Route 20 
New Mexico State Road 20 
New York State Route 20N (former)
New York State Route 20SY (former)
County Route 20 (Allegany County, New York) 
County Route 20 (Clinton County, New York) County Route 20 (Columbia County, New York) County Route 20 (Delaware County, New York) 
County Route 20 (Dutchess County, New York) County Route 20 (Genesee County, New York) 
County Route 20 (Livingston County, New York) County Route 20 (Niagara County, New York) County Route 20 (Ontario County, New York) County Route 20 (Orange County, New York) County Route 20 (Oswego County, New York) County Route 20 (Otsego County, New York) 
County Route 20 (Putnam County, New York) 
County Route 20 (Rensselaer County, New York) 
County Route 20 (Rockland County, New York) 
County Route 20 (Suffolk County, New York) County Route 20 (Ulster County, New York) 
County Route 20 (Washington County, New York) County Route 20 (Yates County, New York) 
North Carolina Highway 20 
North Dakota Highway 20 
Ohio State Route 20 (1923-1927) (former)
Oklahoma State Highway 20 
South Carolina Highway 20 
South Dakota Highway 20 
Tennessee State Route 20 
Texas State Highway 20 
Utah State Route 20 
Virginia State Route 20 
Washington State Route 20 
West Virginia Route 20 
Wisconsin Highway 20 | Preceded by 19 | Lists of highways 20 | Succeeded by 21 |
State Highway 20 (SH 20), also known as the Southwestern Motorway, is a New Zealand state highway linking State Highway 1 at Manukau with State Highway 16 in Point Chevalier, via Māngere and Onehunga. Along with its spurs, State Highway 20A and 20B, the state highway serves Auckland Airport, the country's largest, therefore making SH 20 a key arterial route connecting the airport to the wider Auckland region and most of the upper North Island. The route also forms the southern part of the Western Ring Route, a 48 kilometres (30 mi) motorway route bypassing central Auckland.
