Simon Stadler (German pronunciation: [ˈziːmɔn ˈʃtaːdlɐ];[1][2] born 20 July 1983 in Heidelberg, West Germany) is a German retired professional left-handed tennis player.

After a slow start to the year, Stadler reached Challenger semifinals two weeks in a row in Cremona and Athens to reach his career-high ranking of No.

In June, Stadler qualified in singles for the 2008 Wimbledon Championships, beating British junior No.

He took this form into the main singles draw, where he faced the 18th seed Ivo Karlović from Croatia and beat him in four sets.

He then defeated the aforementioned Brazilian, Thomaz Bellucci in the second round, 8–6 in the fifth.