Ion Țiriac (Romanian pronunciation: [iˈon t͡siriˈak]; born 9 May 1939), also known as the 'Brasov Bulldozer' is a Romanian businessman and former professional tennis and ice hockey player. Tiriac is the developer and owner of the Mutua Madrid Open tennis tournament. In 2013 he was elected into the International Tennis Hall of Fame.

He was born in Transylvania, which is probably the reason why he has the nickname 'Count Dracula'. Țiriac first appeared on the international sports scene as an ice hockey player on the Romanian national team at the 1964 Winter Olympics. Shortly after that he switched to tennis as his main sport. With fellow Romanian Ilie Năstase he won the men's doubles in the 1970 French Open and reached the Davis Cup finals several times in the 1970s.

After his retirement, he served as coach and manager for players such as Ilie Năstase, Guillermo Vilas, Mary Joe Fernández, Goran Ivanišević and Marat Safin.

He managed Boris Becker from 1984 to 1993. In 1998 he became president of the Romanian National Olympic Committee.

Țiriac ran major men's events in Germany, including the season-ending championships in Hanover. Although tennis is now a much smaller part of his portfolio and occupies only 5 percent of his time, he has taken particular pleasure and pride in making Madrid Tennis Open a combined men's and women's event with €7.2 million in total prize money. The trophy awarded to the tournament winner bears his name.

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