Eisa or EISA can have several meanings:
- Eisa:
- A daughter of the god Fornjót in Norse mythology
- A dance in Okinawa Prefecture, Japan
- Tell el-Eisa Hill, near El Alamein in Egypt, site of a cemetery for those who died in the battles.
- EISA:
- Electoral Institute of Southern Africa
- Energy Independence and Security Act of 2007 (EISA 2007)
- Enterprise Information Security Architecture
- European Imaging and Sound Association (EISA Awards)
- Extended Industry Standard Architecture, a bus standard for computer add-on cards.
- EISA partition, An OEM disk partition type.