Ilie "Nasty" Năstase (Romanian pronunciation: [iˈli.e nəsˈtase] ( listen), born 19 July 1946) is a Romanian former world No. 1 professional tennis player, one of the world's top players of the 1970s. Năstase was ranked world No. 1 between 1973 (23 August) and 1974 (2 June). He is one of the five players in history to win more than 100 ATP professional titles (58 singles and 45 in doubles).

Năstase won seven Grand Slam titles: two in singles, three in men's doubles, and two in mixed doubles. He also won four Masters Grand Prix year-end championship titles and seven Championship Series titles (1970–73).

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