The Leeds and York Railway was a proposed railway line, promoted in the mid 1840s, intended to connect York and Leeds. The line lost a significant promoter, the Manchester and Leeds Railway in 1845/6 as a result of a non-competition arrangement between that company and the York and North Midland Railway.
The York and North Midland Railway successfully promoted a rival line in the same session of parliament, and obtained an act for its construction in 1846.
The only part of either scheme that was ever constructed was the Tadcaster Viaduct, built by the Y&NMR on a short spur from the Y&NMR's existing Church Fenton to Harrogate branch. This was completed by 1848 before the Y&NMR decided to abandon construction of the line.