Zac Power is an Australian children's book series by a team of writers under the corporate pseudonym H. I. Larry. The series is based upon the adventures of Zac Power, a twelve-year-old boy, and his fifteen-year-old brother, Leon. Zac is a secret agent for the fictitious intelligence agency GIB, and Zac's adventures frequently see him saving the world. The series was published by Hardie Grant Egmont.