Romualdas Jansonas is a 21-year-old professional football player from LTU. He currently plays for CF Os Belenenses, wearing the number 77 shirt. At the international level, he represents Lithuania U21. He plays primarily as a Forward. His current market value is estimated at 400K €.

His most recent move was a Loan from CF Os Belenenses to FC Arouca on 2026-06-30.

In the Portuguese Liga 3 2025-2026 season, Romualdas Jansonas scored 0 goals and provided 0 assists across 1 appearances, averaging 0 goals per game with 0 shots attempted and 0 on target.