Fy or FY may refer to:
Aerospace Convair XFY Pogo, an experimental aircraft Fengyun, a series of Chinese weather satellites Firefly (airline), Malaysia (IATA code: FY)
Places FY postcode area, England North Macedonia (NATO country code:FY) Fengyang, China
Science Yield strength, of a material Duffy antigen system (International Society for Blood Transfusion code: FY), a classification of human blood groups Feynmanium, or untriseptium
Other uses Fushigi Yûgi, a manga (1991–1996) Fiscal year, in business West Frisian language, spoken in the Netherlands (ISO 639-1: fy)