Oskar Siira Sivertsen is a professional footballer from NOR and is currently 23 years old. He is on the books of Go Ahead Eagles and wears shirt number 11. His main role on the pitch is Forward. He measures 177cm in height and weighs 72kg. His stronger foot is Right. His estimated market valuation currently stands at 450K €.

His latest transfer saw him join Go Ahead Eagles from Kristiansund BK via Free on 2025-02-03. The move was reported at 1.3M €.

During the Netherlands Eredivisie 2025-2026 campaign, Oskar Siira Sivertsen made 23 appearances, scoring 0 goals and adding 1 assists. He averaged 0 goals per match from 7 shots, with 4 on target.