South Line may refer to:

Glasgow South Western Line, Scotland Main South Line, New Zealand Østfold Line, Norway PNR South Main Line, Philippines Sounder South Line, Washington, United States South Eastern Main Line, England South-Link Line, Taiwan South Line, Chennai Suburban, India Main Southern railway line, New South Wales, Australia South Line, a former passenger line in Sydney, Australia, now split into: Inner West & Leppington Line Airport & South Line South West Main Line, England South West Line, Chennai Suburban, India West South Line, Chennai Suburban, India South Line, Tasmania, Australia

See also North–South line (disambiguation) South Western Line (disambiguation) Southern Line (disambiguation) Southern Railway (disambiguation)