Police say Jake Kermond was last seen in the lobby of his hotel by front desk staff on the evening of April 26.
Then on April 30, hotel staff discovered his apparently abandoned belongings in his room.
Police say his parents in Australia have not heard from their son, and officers have conducted an extensive investigation.
Kermond was last seen wearing a green baggy ski jacket, a black-and-white baseball cap and possibly black pants.
Anyone who might have information on his whereabouts is asked to contact Whistler RCMP.