- Y stands for Why
- Y stands for Year
- Y stands for Yahoo! (Internet search engine)
- Y stands for Yes
- Y stands for Yellow
- Y stands for Corporation (IRB)
- Y stands for Income (economics)
- Y stands for Economy (class airfare)
- Y stands for Business Class (Air Freight; also see C, Economy Class)
- Y stands for Yard
- Y stands for Yankee (aviation letter code)
- Y stands for Yen (Japanese currency)
- Y stands for Yukon Territory (postal code designation, Canada)
- Y stands for Y Chromosome
- Y stands for Bundeswehr (German Armed Forces; number plate)
- Y stands for Tyrosine (amino acid)
- Y stands for Yaw
- Y stands for Yttrium
- Y stands for Yeoman
- Y stands for Luminance (signal)
- Y stands for Consolidated-Vultee Aircraft Corporation (manufacturer’s symbol; now Convair)
- Y stands for Yotta- (prefix, 10^24 or septillion)
- Y stands for Yocto (prefix for one septillionth, 10^ -24)
- Y stands for Male Chromosome
- Y stands for Yukon Standard Time
- Y stands for YMCA or YWCA (Young Men’s Christian Association or Young Women’s Christian Association)
- Y stands for Search and Rescue Unit (SRU) Error (US DoD)
- Y stands for US DoT tire speed rating (188 mph)
- Y stands for Vertical axis in Cartesian coordinate system
- Y stands for Navigational error of search craft
- Y stands for Prototype Aircraft Designation
Y