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