Joachim Williamson is a 18-year-old professional football player from SUI. He plays primarily as a Defender. His preferred foot is Left.

His most recent move was a Loan from Inter Milan U19 to Grasshoppers U21 on 2026-06-30.

Throughout the UEFA Youth League 2025-2026, Joachim Williamson featured in 5 matches, averaging 0.2 tackles, 0.2 interceptions, and 0.2 clearances per game, while blocking 0 shots per game.