The Weedon–Marton Junction line (also known as the Weedon–Leamington line) was a rural branch line in England that linked the West Coast Main Line at Weedon, running via Daventry to Marton Junction, where it joined the Rugby to Leamington line and thus connected to Leamington Spa.
There were six stations on the line:
Trains to Leamington called at the now closed Leamington Spa (Avenue) station, and either terminated at the now closed Milverton station, or continued to Nuneaton.
The line was single track throughout with passing loops at each of the stations except Flecknoe. Provision was made for a passing loop at Flecknoe, but it was never used. The line passed under the Great Central Main Line at Wolfhampcote between Braunston and Flecknoe, but there was never any physical connection between the two lines.
The single track line was constructed in two phases by the London and North Western Railway (LNWR). First a four-mile (6 km) long branch to Daventry from the West Coast Main Line at Weedon was constructed in 1888, opening on 1 March of that year.
In 1890 the LNWR obtained powers to build a 14 mile (22 km) extension of the branch to reach the existing Rugby to Leamington line at Marton Junction (just south of the village of Marton). The extension was opened on 1 August 1895.