Two contractors got into a fight Friday at Universal's Islands of Adventure, and one of them, Frederick Torres, 33, was charged with attempted murder, Orlando police said.
The other man involved in the dispute was taken to a hospital and is in critical condition. His name was not released.
Universal Orlando spokesman Tom Schroder said no park guests were involved.
"This was an incident that involved people who worked for a contractor," Schroder said in a statement. "No guests were involved, no Universal Orlando team members were involved."
Police said they do not know the reason for the fight.
Police have not said where in the theme park the fight happened.