Luke Bryant, 32, was on holiday with his brother, Travis, 33, and both were staying at the Patong Merlin Hotel. Both are understood to be from Melbourne.
On Sunday night, both brothers went to the Lilly bar, in the OTOP market complex opposite Hard Rock Cafe, on Rat-U-Thit-200-Pee Rd in Patong.
At around 3am on Monday morning, Travis returned back to the hotel, but Luke stayed out.
At around 5am, Luke returned to the hotel and Travis was not there. He went back to the bar area to look for him, but couldn’t find him. Luke then reported his brother missing to police.
Anyone who has seen Travis can contact Kathu Police Station on 076-342-719.