Romualdas Jansonas (born 23 June 2005) is a Lithuanian professional footballer who plays as a forward for Arouca.
Jansonas was born on 23 June 2005. Born in Vilnius, Lithuania, he is a native of the city.
As a youth player, Jansonas joined the youth academy of Lithuanian side à ½algiris, where he played in the UEFA Youth League and was promoted to the club's senior team ahead of the 2023 season, where he made forty-seven league appearances and scored two goals and helped them win the league title.
Following his stint there, he signed for Lithuanian side Kauno à ½algiris in 2025, where he made twenty-three league appearances and scored six goals. Subsequently, he signed for Portuguese side Arouca the same year.
Jansonas is a Lithuania international. During the autumn of 2025, he played for the Lithuania national football team for 2026 FIFA World Cup qualification.