Line 18 may refer to:

• Line 18 (Chengdu Metro)
• Line 18 (Chongqing Rail Transit) (under construction)
• Line 18 (Guangzhou Metro)
• Line 18 (Shanghai Metro)

• Line 18 (São Paulo Metro), Brazil (cancelled)
• Line 18 (Stockholm Metro), a Green line, Sweden
• Line 18 (Zürich), or Forch railway, Switzerland
• Paris Métro Line 18, France (under construction)
• Line 18, serving the Sinsen Line of the Oslo Tramway, Norway

This disambiguation page lists articles associated with the title Line 18.
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