Eo or EO may refer to:
The Eocene (pronunciation: /ˈiːəˌsiːn, ˈiːoʊ-/) Epoch, lasting from 56 to 33.9 million years ago, is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era.
Professor Eobard "Zoom" Thawne, otherwise known as the Reverse-Flash, is a fictional supervillain appearing in comic books published by DC Comics.
Eoin Joseph Gerard Morgan (born 10 September 1986) is a cricketer who captains the England national cricket team in One Day Internationals and Twenty 20 International.
EOKA (/eɪˈoʊkə/) was a Greek Cypriot nationalist guerrilla organisation that fought a campaign for the end of British rule in Cyprus, for the island's self-determination and for eventual union with Greece.
Eosinophilic granulomatosis with polyangiitis (EGPA; also known as Churg-Strauss syndrome [CSS] or allergic granulomatosis) is a rare autoimmune condition that causes inflammation of small and medium-sized blood vessels (vasculitis) in persons with a history of airway allergic hypersensitivity (atopy).
Eosinophils, sometimes called eosinophiles or, less commonly, acidophils, are a variety of white blood cells and one of the immune system components responsible for combating multicellular parasites and certain infections in vertebrates.
Eoin Colfer (/ˈoʊ.ᵻn/; born 14 May 1965) is an Irish author of children's books. He worked as a primary school teacher before he became a full-time writer.
Eosinophilia is a condition in which the eosinophil count in the peripheral blood exceeds 4.5×108/L (450/µL).
Eoin Kelly (born 6 January 1982) is an Irish hurler who played as a right corner-forward for the Tipperary senior team.