Power of Three may refer to:
- Power of three, a number of the form 3n
- Third power, a number of the form n3
- Power of Three (novel), a novel by Diana Wynne Jones
- Power of Three (Fatso Jetson album)
- Power of Three (Michel Petrucciani album)
- Power of Three (Charmed)
- "The Power of Three" (Doctor Who)
- "The Power of Three", an episode of Teenage Mutant Ninja Turtles
- "The Power of Three", a 2013 episode of Ancient Aliens
- Warriors: Power of Three, an arc in the fantasy novel series Warriors by Erin Hunter
- The Power of Three, a music album by Monte Pittman
- Jai Lava Kusa, a 2017 Indian film by K. S. Ravindra, also known as The Power of Three