Defiant Development was an Australian game developer based in Brisbane, Australia, founded in 2010. The studio developed mobile, console, educational, and augmented reality games, and was best known for Rocket Bunnies (iOS and Android), Hoops AR (Augmented Reality for Android), Warco (Freeplay award winning game about journalism in a warzone) and Heroes Call (tablet action RPG).

After its closing, former members of Defiant Development went on to form Spitfire Interactive.