The Northern line is a London Underground line that runs between North London and South London.

Northern line can also refer to:

Train lines and services United Kingdom North London line, part of the London Overground Northern City Line, between Moorgate and Finsbury Park Northern line (Merseyrail)

Elsewhere Nordland Line, Norway Northern Line (Cape Town) Northern Line (SRT), Thailand Northern line (Sri Lanka) T9 Northern Line (Sydney), Australia Northern Commuter line, Dublin Linha do Norte (English: Northern Line), a railway line in Portugal, connecting Lisbon at Santa Apolónia to Porto at Campanhã

Other uses Northern Line (group) Northern Airport Line, China Northern Limit Line, the maritime border between North and South Korea

See also North Line (disambiguation) Northern Railway (disambiguation)