The following highways are numbered 255:

Canada

• Manitoba Provincial Road 255
• New Brunswick Route 255
• Nova Scotia Route 255
• Quebec Route 255
• Saskatchewan Highway 255

Costa Rica

• National Route 255

Japan

• Japan National Route 255

Korea, South

• Gangjin–Gwangju Expressway

United States

• Interstate 255
• Alabama State Route 255
• Arkansas Highway 255
• California State Route 255
• Florida State Road 255 (former)
• Georgia State Route 255
• Illinois Route 255
• K-255 (Kansas highway)
• Kentucky Route 255
• Maryland Route 255
• Montana Secondary Highway 255
• New Mexico State Road 255
• New York State Route 255 (former)
• Ohio State Route 255
• Oregon Route 255
• Pennsylvania Route 255
• Tennessee State Route 255
• Texas State Highway 255
• Utah State Route 255 (former)
• Virginia State Route 255
• Wyoming Highway 255