King's Cross St. Pancras is a tube station in the London Borough of Camden, on the London Underground network, serving both King's Cross and St Pancras main line stations. It is in Travelcard Zone 1.

King's Cross St. Pancras is the biggest interchange station on the London Underground, with six lines on four pairs of tracks.The first underground station at King's Cross opened as part of the original section of the Metropolitan Railway in 1863 and was rearranged in 1868 and 1926.