5S

5S may refer to:


 * 5S (methodology), a Japanese management methodology
 * 5S ribosomal RNA
 * Select Society of Sanitary Sludge Shovelers
 * A series of Toyota S engines
 * A technique for calming babies, as suggested by Harvey Karp
 * iPhone 5S, a smartphone by Apple Inc.
 * 5S, the production code for the 1981 Doctor Who serial Warriors' Gate
 * Fives, an English sport