Romas Ubartas (born 26 May 1960 in Panevežys) is a retired male discus thrower from Lithuania who won a silver medal at the 1988 Summer Olympics for the USSR and a gold medal at the 1992 Summer Olympics for Lithuania.
His personal best was 70.06m.
He also became European champion, in 1986.
When Lithuania was part of the Soviet Union, he trained at Dynamo in Vilnius.
In 1993, after finishing fourth at the World Track and Field Championships last month in Germany, Ubartas failed a doping test and was disqualified for four years.