Testudo (which meant "tortoise" in classical Latin) may refer to:
- Testudo (turtle), a genus of tortoises
- Testudo, the Latin variant of the Greek chelys harp, involving a sound-box made from a tortoise shell
- Testudo, name used in medieval Latin for the lute
- The testudo formation, a Roman military tactic, where a formation of soldiers used their shields to form a tortoise-shell-like protective cover against incoming missiles
- Battering ram, an armored siege engine of antiquity, with metal plating on the top to protect from missiles fired from above
- The name of the official mascot of the University of Maryland, College Park, a diamondback terrapin
- Testudo – Pisces (constellation)#Asterisms and subdivision, an obsolete constellation now in the constellation of Pisces
- Ian Harwood. "Testudo". In L. Root, Deane. Grove Music Online. Oxford Music Online. Oxford University Press. (subscription required)
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