Blatnik is a surname. Notable people with the surname include: * Al Blatnik (1923–2011), American football and basketball coach * Andrej Blatnik (born 1963), Slovene writer * Gregor Blatnik (born 1972), Slovenian retired international footballer * John Blatnik (1911–1991), United States Congressman from Minnesota * Johnny Blatnik (1921–2004), American professional baseball outfielder * Tatiana Blatnik, birth name of Princess Tatiana of Greece and Denmark (born 1980) * Thais Blatnik (1919–2015), American journalist

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