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S4, S 4, Š-4, S.4 or S-4 may refer to:

In arts, hobbies, and entertainment[edit]

In science and technology[edit]

In biology and medicine[edit]

In computing[edit]

In mathematics[edit]

In other sciences[edit]

Other technologies[edit]

For uses in transportation, see section § In Transportation, below.

In transportation[edit]

Air transport[edit]

Rail transport[edit]

Rail lines[edit]

Road transport[edit]

Bus Services[edit]

Other forms of transport[edit]

Other uses[edit]

  • S4 (military), a logistics officer within military units
  • S-4 (Sector Four) an alleged facility in the Papoose Lake portion of Area 51 investigating alien spacecraft
  • Form S-4, a form required by the Securities and Exchange Commission to declare mergers and acquisitions
  • S04, or FC Schalke 04, a German professional sports club
  • S postcode area, covering areas of northern Sheffield, England
  • S4 (Dota player), Gustav Magnusson, Swedish Dota 2 player