Legio X Fretensis (Latin: "Tenth legion of the sea strait") was a Roman legion levied by Augustus in 41/40 BC to fight during the period of civil war that started the dissolution of the Roman Republic. X Fretensis is recorded to exist at least until 410s.

X Fretensis symbols were the bull, the holy animal of the goddess Venus (mythical ancestor of the gens Julia), a ship (probably a reference to the battles of Naulochus and/or Actium), the god Neptune, and a boar. The symbol of Taurus may also mean that it was organized between 20 April and 20 May.

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