Oskar Siira Sivertsen is a 22-year-old professional football player from NOR. He currently plays for Go Ahead Eagles, wearing the number 11 shirt. He plays primarily as a Forward. He stands at 177cm tall and weighs 72kg. His preferred foot is Right. His current market value is estimated at 450K €.

His most recent move was a Free from Kristiansund BK to Go Ahead Eagles on 2025-02-02. The reported fee was 1.3M €.

In the Netherlands Eredivisie 2025-2026 season, Oskar Siira Sivertsen scored 0 goals and provided 1 assists across 23 appearances, averaging 0 goals per game with 7 shots attempted and 4 on target.