Sigma 6

Sigma 6 may refer to:

• G.I. Joe: Sigma 6, a line of military-themed action figures and toys
• SDS Sigma 6, one of the SDS Sigma series of computers made by Scientific Data Systems
• Pink Floyd, a British rock group originally called Sigma 6

• Six Sigma, a set of techniques and tools for process improvement
• 68–95–99.7 rule, or Three sigma rule, in statistics