Ostia may refer to:
- Ostia Antica, a township and port of ancient Rome
- Ostia (town) , a modern township (also called Ostia Lido or Lido di Ostia) on the Tyrrhenian Sea coast, near Rome, Italy. Ostia Antica was the Harbour of Ancient Rome and perhaps its first colonia. Ostia is a large neighborhood in the XIII Municipio of the comune of Rome, Italy.
Usually, when modern Roman people say «Ostia» they refer to the modern town, not the nearby archaeological site.
It can also refer to either of two modern districts of Rome:
- Ostia Antica (district) (originally known as Gregoriopolis)
- Ostia is also the plural of ostium. Rome ( Roma ˈroma Roma is the capital city of Italy and Lazio, and is Italy's largest and most populous city with more than 2 Ostia Antica is a district in the commune of Rome, Italy, five kilometers away from the coast
- Ostia, a song by Sepultura from their Dante XXI album. Sepultura ( Portuguese: Grave) are a Brazilian heavy metal band from Belo Horizonte, Minas Gerais, formed in 1984 Dante XXI is the tenth studio album by Brazilian Thrash metal band Sepultura, released in 2006 through SPV Records.
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