Eta (Η, η) is the seventh letter of the Greek alphabet
Eta or ETA may also refer to:
People
- Eta (given name)
 - Eta, a derogatory term for the Burakumin in the Japanese feudal era
 - ETA, an Elvis Tribute Artist
 
Aircraft
- Eta (glider), a German glider
 - CNA Eta, an Italian aircraft
 
Brands and enterprises
- Eta, a snack food brand owned by Griffin's Foods
 - Empresa de Transporte Aéreo, a defunct Brazilian Airline
 - Environmental Transport Association, a British roadside assistance company
 - ETA SA, a Swiss watchmaking company
 - ETA Star Group, a Dubai-based investment company
 - ETA Systems, a defunct American computer manufacturer
 
Education
- Engineering & Technologies Academy, in San Antonio, Texas, United States
 - Ethiopian Teachers' Association, a trade union
 - Evangelical Theological Academy, in Zwijndrecht, Netherlands
 - Evangelical Theological Association, a former teaching institute in Melbourne, Australia
 
Government and politics
- ETA (separatist group) (Basque: Euskadi Ta Askatasuna), a Basque armed separatist group
 - Electronic Travel Authorization or Electronic Travel Authority, an alternative to a travel visa required by many countries for entry
 - Employment and Training Administration, of the United States Department of Labor
 - European Technical Assessment of the European Organisation for Technical Approvals
 
Mathematics
- Dedekind eta function
 - Dirichlet eta function
 - Eta conversion
 - Eta invariant
 - Weierstrass eta function
 - The small letter eta is used as 't Hooft symbol
 
Science and technology
- Eicosatetraenoic acid
 - Eta meson
 - Ethanolamine
 - Event tree analysis
 - Exfoliatin
 - Hapticity
 - Pseudorapidity
 - Reproduction factor, in the nuclear engineering four factor formula
 - Viscosity
 - Entropy as defined in Boltzmann's H-theorem
 - SARS-CoV-2 Eta variant, one of the variants of SARS-CoV-2, the virus that causes COVID-19
 
Music
- "E.T.A.", a song by Damon & Naomi from More Sad Hits, 1992
 - "E.T.A.", a song by Justin Bieber from Changes, 2020
 - "ETA", a song by Dr. Dre, Snoop Dogg, Busta Rhymes and Anderson .Paak from GTA Online: The Contract, 2022
 - "ETA" (song), a song by NewJeans from Get Up, 2023
 
Other uses
- Estimated time of arrival
 - England Touch Association, the national governing body for touch rugby within England
 - Hurricane Eta, a damaging and deadly Category 4 hurricane that occurred in the 2020 Atlantic hurricane season
 - 'eta, a letter or glottal stop in the Tahitian languages
 - Electronics Technicians Association, a professional association
 - Landolphia owariensis, a vine native to Africa and sometimes known as eta
 
See also
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