Kęstutis Ruzgys (born 15 September 1962) is a retired Lithuanian football forward who played in Soviet Union, Baltic states, Yugoslavia and Germany during his professional career. Ruzgys was born in Klaipėda. He played with FK Žalgiris Vilnius in the Soviet First League in addition to OFK Beograd in the Yugoslav First League. He won a total of three caps for the Lithuanian national team, scoring no goals, while playing in Serbia as a professional for OFK Beograd. He ended his career playing in Germany with Sportfreunde Siegen.