Hy

HY or Hy may refer to:

Science and technology

 * Hy (programming language), a Lisp dialect for Python
 * HY (satellite), a series of Chinese marine remote sensing satellites
 * H-Y antigen, a male tissue specific antigen

Other uses

 * HY (band), a Japanese band
 * Hy (island), a pre-Christian and early Christian name for the Scottish island Iona
 * Hy (name), a given name, nickname, or surname
 * Armenian language (ISO 639-1 language code: hy)
 * Uzbekistan Airways (IATA code: HY), the national airline of Uzbekistan