Sigma (disambiguation)
- Bayer designation
- Betsy (Russian singer)
- BioShock 2
- Bungo Stray Dogs
- Charge density
- Chrysler Sigma
- Columbo (season 6)
- Cross section (physics)
- Divisor function
- Dota 2
- Ferrari Sigma
- Ford Sigma engine
- GM Sigma platform
- Hammett equation
- Harish-Chandra's σ function
- Histor–Sigma
- Mitsubishi Sigma
- M–sigma relation
- Ninja Gaiden Sigma
- Ood
- Pauli matrices
- SDS Sigma series
- SIGMA (verification service)
- SIGMA 155
- SK Sigma Olomouc
- Sigma
- Sigma (DJs)
- Sigma (Mega Man X)
- Sigma (Overwatch)
- Sigma (album)
- Sigma (analytics company)
- Sigma (couch)
- Sigma (operations research)
- Sigma (sailplane)
- Sigma AB
- Sigma Alimentos
- Sigma Boy
- Sigma Canis Majoris
- Sigma Corporation
- Sigma Designs
- Sigma Draconis
- Sigma FC
- Sigma Guitars
- Sigma Harmonics
- Sigma Healthcare
- Sigma Motor Corporation
- Sigma Motors
- Sigma Octantis
- Sigma Orionis
- Sigma Sigma Sigma
- Sigma Sport
- Sigma TV
- Sigma additivity
- Sigma baryon
- Sigma class corvette
- Sigma male
- Sigma receptor
- Sigma, Capiz
- Sigma, Lee County, Virginia
- Sigma-Aldrich
- Sigma-algebra
- Six Sigma
- Space City Sigma
- Standard deviation
- Stefan–Boltzmann constant
- Summation
- Sygma (disambiguation)
- Sığma, Sarayköy
- Telkomsigma
- Tweeny Witches
- Universal Sigma
- Weierstrass sigma function
- Zero Escape