According to the National Park Service, 49-year-old Charles Lyon of Tyler, Texas was last seen on June 10 at the Best Western in Tusayan.
Lyon's vehicle was found abandoned on the South Rim near Lipan Point on June 11.
Lyon is believed to be traveling alone.
"It is unknown what clothing Lyon may have been wearing or what hear he may have had with him," officials said on Monday.
Lyon is 6'3", weighs 177 pounds and has brown hair and brown eyes.
If you have any information, please call or text NPS ISB at 888-653-0009.
More Missing Persons
- Apollo Beach 'hero' who jumped in water to save father, son still missing
- Maricopa County dive team still searching for missing man in Bartlett Lake
- Deputies searching for missing Georgia first-grade teacher
Tune in to FOX 10 Phoenix for the latest news:
Get breaking news alerts in the FREE FOX 10 News app. Download for Apple iOS or Android.