HYS

HYS or HyS may refer to:

• Hayes railway station (station code: HYS), a railway station located in Hayes in the London Borough of Bromley
• Hays Regional Airport (IATA code: HYS), a general-aviation airport in Ellis County, Kansas
• Heep Yunn School, an Anglican girls' secondary school in Hong Kong
• Hybrid sulfur cycle (HyS), a two-step water-splitting process
• HYS The Hague, the ice hockey club in The Hague, Netherlands