Gy or GY may refer to:
- Hungarian gy, an alphabetic digraph
- a digraph in the Tibetan Pinyin transliteration system
- GenCorp (GY NYSE symbol)
- Green Youth (disambiguation), one of two Green party youth wings
- Grapevine yellows a plant disease
- Gy - The on-line charging interface in the GPRS Core Network
Read more about Gy: Measurement, Places, Transport, People With The Surname