USS 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), 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, a Terran Rebellion starship from the 24th century mirror universe
 * HMS Defiant, 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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