Y
- Yakir AharonovIsraeli physicist (born 1932)
- Yang–Mills existence and mass gapMillennium Prize Problem
- Yang–Mills theoryQuantum field theory
- YCbCrFamily of digital color spaces
- YellowColor between orange and green on the visible spectrum of light
- Yield (engineering)Phenomenon of deformation due to structural stress
- Young's modulusMechanical property that measures stiffness of a solid material
- Yttrium orthovanadateYttrium orthovanadate (YVO4) is a transparent crystal. Undoped YVO4 is also used to make e
- Yukawa potentialScreened Coulomb potential which exponentially decays
- Yuval Ne'emanIsraeli scientist
- Yvette d'EntremontYvette d'Entremont, also known as SciBabe, is an American public speaker, science blogger,
- Yvonne Choquet-BruhatFrench mathematical physicist (1923–2025)