South Line

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