Defiant
Defiant could refer to:
One of the various Federation starships of that name:
 USS Defiant (NCC-1764), a Constitution-class starship
 USS Defiant (2370), registry NX-74205, lead ship of the class, the first Defiant-class starship to bear the name
 USS Defiant (2375), the second Defiant-class starship to bear the name (formerly the USS Sao Paulo)
The Defiant (alternate reality), an alternate universe ship mentioned only in the script of Star Trek.
The , a Terran Rebellion starship from the 24th century mirror universe
, The British Royal Navy ship
The  escort, a Federation starship type
, a Season Three episode of Star Trek: Deep Space Nine

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