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Euroclydon (or in Latin: Euroaquilo) is a cyclonic tempestuous northeast wind which blows in the Mediterranean, mostly in autumn and winter. It is the modern Gregalia (Gregale) or Levanter. From the Greek word eurokludōn [εὐροκλύδων], from Euros (Eurus, meaning east wind) and either the Greek word akulōn (akylōn, meaning north wind), or kludon (meaning a surging wave from the verb kluzo meaning to billow) or the Latin word aquilō (aquilon). Euroclydon is not to be confused with the term Nor'easter, which is a separate storm system that forms in the northeastern portion of the United States.
- In chapter 27 in the Book of Acts 27:14 it may specifically refer to the name of the Gregale wind from the Adriatic Gulf, which wrecked the apostle Paul's ship on the coast of Malta on his way to Rome.
- It is referenced in the second chapter of Moby-Dick.
- Euroclydon is also the name of an anthem by William Billings
- Referenced in "The Roman Centurion's Song" by Rudyard Kipling: "Here where our stiff-necked British oaks confront Euroclydon!"
- Referenced in Dorothy L. Sayers' novel The Nine Tailors  where after a rainstorm, the Rector uses the phrase from Acts 27:14