The Central line is a London Underground line that runs through central London, from Epping, Essex, in the north-east to Ealing Broadway and West Ruislip in the west. Printed in red on the Tube map, the line serves 49 stations over 46 miles (74 km). It is one of only two lines on the Underground network to cross the Greater London boundary, the other being the Metropolitan line. One of London's deep-level railways.

The line was opened as the Central London Railway in 1900.

There are three depots: Ruislip, Hainault and White City. White City depot first opened in 1900 when the initial line went into operation; Ruislip and Hainault depots were completed in 1939. During the Second World War, anti-aircraft guns were made at Ruislip Depot and the U.S. Army Transportation Corps assembled rolling stock at Hainault between 1943 and 1945. As part of the construction of the Westfield London shopping centre, the depot at White City was replaced underground, opening in 2007.