Happy Jack is an unincorporated community and campground located in the Mogollon Rim Region of Coconino County, Arizona, United States.

It is located on Lake Mary Road southeast of Flagstaff, Arizona.

The logging company requested Happy Jack be moved 13 miles, closer to Clints Well, starting around 1974.

[6] Happy Jack may have been named for a cheerful local lumberman.

[7] However, another newspaper report says the Coconino National Forest Supervisor Ronald Rotty named Happy Jack, after an area of Wyoming where a bandit named Happy Jack committed crimes.