Eris typically refers to:
- Eris (mythology), the goddess of discord in Greek mythology
- Eris (Billy and Mandy), a comedic representation of the Greek goddess in the television show The Grim Adventures of Billy and Mandy
- Eriş, Turkish name
- Eris (dwarf planet), the most massive known dwarf planet in the Solar System (provisional designation 2003 UB313)
- Eris (genus), a genus of jumping spiders
Eris may also refer to:
- Exoatmospheric Reentry-vehicle Interception System, a project of the Strategic Defense Initiative
- Eris (simulation), simulation of the Milky way galaxy
- Eris (Star Trek), a Vorta character played by Molly Hagan
- Eris, a character from the video game Drakengard 2 voiced by Saki Aibu
- Eris, one of the fictional planets in Damocles (video game) and its successor Mercenary III
- The HTC Droid Eris, a variant of the HTC Hero mobile phone that is offered by Verizon Wireless