5Y

5Y or 5-Y may refer to:

• 5 years
• 5Y, IATA code for Atlas Air
• 5Y, the Aircraft registration code for Kenya
• 5 Whys, a question-asking technique for identifying causes of a defect or problem
• 5Y, the production code for the 1982 Doctor Who serial Kinda

See also

• Y5 (disambiguation)