Sergiu Ioan Viorel Costin (born 21 November 1978) is a Romanian former football player who played as a defender for teams such as Gloria Bistrița, Unirea Dej. Olimpia Satu Mare, Oțelul Galați or Someșul Dej, among others.

Honours Oțelul Galați Liga I: 2010–11 Supercupa României: 2011

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