• Eid, Norway, a municipality of Norway
• An Arabic word (عيد ‘īd "festival"), and more specifically any of the following celebrations:
• Eid ul-Fitr (Arabic: عيد الفطر ‘īdu l-fiṭr "Festival of the Fast Breaking"), which marks the end of the month of Ramadan
• Eid ul-Adha (Arabic: عيد الأضحى ‘īdu l-’aḍḥā "Festival of the Sacrifice") or Eid-e Qurban (Persian: عید قربان eyde qorbân) which is celebrated to commemorate Ibrahim's willingness to sacrifice his son for God
• Eid-e Nowruz (Persian: عید نوروز eyde nowruz), which marks the first day of spring and the beginning of the Iranian year as well as the Baha'i year
• Eid Mubarak (Persian: عید مبارک eyd mobârak, from the Arabic عید مبارﻙ ‘īd mubārak, lit. "blessed festival"), a greeting used by Muslims during Eid ul-Fitr and Eid ul-Adha.
• Eid Milad an Nabi ("Festival of the birth of the Prophet"), one of several names for Mawlid
• Eid E Shuja

The abbreviation EID may stand for:

• Ecological interface design, a design framework for complex sociotechnical systems.
• Electronic identity card, a smartcard used for proof of identity.
• Emerging infectious disease, an infectious disease whose incidence has increased within the past two decades and which threatens to increase in the near future.
• Endpoint Identifier, an addressing construct used in Delay-Tolerant Networking.