Police said Mohamad El Wazzi, 29, was stabbed on the left side of his chest during a brawl near the Soi Leng Ki Intersection in Central Pattaya at 2.30am.
He was rushed to the Pattaya City Hospital. The two Thai men fled the scene on a motorcycle after the attack.
Witnesses told police that the tourist was shopping when two Thai men arrived on a motorcycle and started shouting at the Lebanese man. The two Thai men accused the Lebanese man of hitting their motorcycle and leaving the scene without apologising.
During the brawl the two Thai men struggled with the larger tourist until one of them pulled out a sharp object and stabbed him and they fled the scene, witnesses said.