The Dunstable Branch Lines were railway branch lines that joined the English town of Dunstable to the main lines at Leighton Buzzard and Welwyn. The two lines were under separate ownership and joined just east of the Dunstable North station.The London and North Western Railway built the line from Leighton Buzzard station to Dunstable. This opened in 1848.The Luton, Dunstable and Welwyn Junction Railway planned a connecting line from the Great Northern Railway at Welwyn.