Zia or ZIA (also spelled Ziya, Ḍiya, Dia or Diya) may refer to:

• Zia (name), including a list of people and fictional characters with the name
  • A romanization of the Wu (Shanghainese) pronunciation of the Chinese surname Xie (謝)
• Zia people (New Mexico)
• Zia people (Papua New Guinea)
  • The Zia language of Papua New Guinea

• Zamboanga International Airport, Philippines
• Zhukovsky International Airport, Russia
• Zia International Airport, Bangladesh, now Shahjalal International Airport
• ZIA, a musical group founded by Elaine Walker

• Zia (brachiopod), a genus of brachiopods
• Zia (novel), by Scott O'Dell
• Applebay Zia, motor glider
• Zia, a small village on the Greek island of Kos
• Zia clan of the Diné, or Navajo, people
• Zia Record Exchange, a regional chain of record shops located across the American Southwest

• Sia (disambiguation)
• Tzia or Zia (Greek: Τζια), an alternative name for Kea (island), Cyclades, Greece
• Ziya, the Turkish spelling of the Arabic name
• Ziaur a compound name beginning with "Zia"
• Ziauddin a common transliteration a common name