Romualdas Jansonas is a professional footballer from LTU and is currently 21 years old. He is on the books of CF Os Belenenses and wears shirt number 77. At international level, he features for Lithuania U21. His main role on the pitch is Forward. His estimated market valuation currently stands at 400K €.

His latest transfer saw him join FC Arouca from CF Os Belenenses via Loan on 2026-06-30.

During the Portuguese Liga 3 2025-2026 campaign, Romualdas Jansonas made 1 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.