Police received a report from local residents on Monday night about a violent confrontation. When they arrived at the scene, they found a male tourist with severe abdominal injuries, Pattaya Mail reported.
The victim was taken to a nearby hospital but succumbed to his injuries.
The suspect, a 27-year-old American tourist, was apprehended at the scene with a fruit knife believed to be the weapon used in the stabbing, The Phuket News reported.
According to police, both were involved in an argument before it escalated into a physical fight.
An investigation is ongoing.