Sergey F. Dezhnyuk (born January 5, 1976) is a Ukrainian-American theologian, historian, and political analyst. He was a chair of Ethnic Council, CBA of Oklahoma City until 2005. Since 2005, Dezhnyuk serves as a vice-president of Independent American Center of Political Monitoring. Dezhnyuk specializes in historical theology with concentration on the Council of Florence and analysis of the Union it produced. As a former Ukrainian politician, he also writes on the topics that intersect religion and public life. Dezhnyuk is a member of American Society of Church History,