Zay may refer to:

• Zay people, an ethnic group of Ethiopia
• Zay language, a language of Ethiopia
• Zay (name), a list of people and fictional characters with the nickname, given name or surname
• Zay (river), Tatarstan, Russian Federation
• Zay or Zainsk Reservoir, Tatarstan, Russian Federation
• Arabic letter zāy ز
• zay, ISO 639-3 code for the Zayse-Zergulla language spoken in Ethiopia

• Zai (disambiguation)
• Zey, Adıyaman, Turkey, a village