The A63 is a major road in Yorkshire, England between Leeds and Kingston upon Hull. A section between South Cave and Hull forms the eastward continuation of the M62 motorway and is part of the unsigned Euroroute E20.
The route from Leeds out to Selby runs roughly parallel, and between 0.6 and 2 miles (1 and 3 km) south of the route of the Leeds and Selby Railway.
The route begins just east of Leeds city centre at a junction with the A61, although, before its February 2009 realignment along the new East Leeds Link Road, it began at a junction with the A64 in the Halton Moor area of the city (now signed as the B6159). The road passes through the Knowsthorpe and Cross Green areas, as Pontefract Lane; despite being of dual carriageway standard, is subject to a 40 mph speed limit, and incorporates peak-time HOV lanes. At the end of this dual carriageway section, the route meets the M1, and the road continues north along the motorway for one junction then resumes as the A63.