| Y | Admittance 
| Others |
| Y | Contrast (gamma)
| Others |
| Y | Luminance Component
| Others |
| Y | Luminosity
| Others |
| Y | Out-of-plane Position - vertical
| Others |
| Y | Search and Rescue Unit Error
| Others |
| Y | Vertical axis
| Others |
| Y | Vertical axis (plotter Y-axis)
| Others |
| Y | Why?
| Others |
| Y | Width of vehicle or structure - Horizontal Axis
| Others |
| Y | Y-axis
| Others |
| Y | Y-axis (vertical axis)
| Others |
| Y | YACC Grammar file
| Others |
| Y | Yards
| Others |
| Y | Yaw
| Others |
| Y | Year or years
| Others |
| Y | Years
| Others |
| Y | Yelling
| Others |
| Y | Yellow
| Others |
| Y | Yes
| Others |
| Y | Yesterday
| Others |
| Y | Yield
| Others |
| Y | Ymca
| Others |
| y | Yocto
| Others |
| Y | Youthful
| Others |
| Y | Yttrium
| Element |
| Y | Yukon Standard Time [UTC - 0900]
| Others |
| Y OF GUN | Yeoman Of The Gunroom
| Others |
| Y&R | Young and the Restless
| Others |
| Y' | Out-of-plane Velocity - vertical
| Others |
| Y' | Y-axis Rate of Change
| Others |
| Y'' | Y-axis Rate of Acceleration
| Others |
| Y''' | Y-axis rate of change of Acceleration
| Others |
| Y'ALL | You All
| Others |
| Y-ME | Y- ME National Breast Cancer Organization
| Others |
| Y-O-Y | Year-Over-Year
| Others |
| Y.O.T.I | Youth of Tortured Idealism
| Others |
| Y/A | Years of age
| Others |
| Y/N | Yes or No
| Others |
| Y/O | Year Old
| Others |
| Y/O | Year-Old
| Others |
| y/o | Years Old
| Others |
| Y1 | Yeoman First Class
| Others |
| Y15 | Cheboygan City- County Airport, Cheboygan, Michigan USA
| Others |
| Y2 | Yeoman Second Class
| Others |
| Y20 | Yaris Twentieth Anniversary Edition
| Others |
| Y2K | Year 2000
| Others |
| Y2K | Year Two Thousand
| Others |
| Y2K | Year Two Thousand (2000)
| Others |
| Y2KC | Year 2000 Compatibility
| Others |