Lidia Slăvuțeanu-Șimon (born 4 September 1973) is a Romanian long-distance runner.

At the 2000 Summer Olympics in Sydney she won the silver medal behind Naoko Takahashi, Japan but ahead of Joyce Chepchumba, Kenya.

She returned to compete at the 2004 Summer Olympics, but she failed to finish the race.

She has been highly successful at the Osaka Ladies Marathon, winning three times consecutively from 1998 to 2000.

The only person ever to defeat Șimon was her own husband, who, not being a professional athlete, started among one group of tarentos and managed not only to outrun all the TV stars but to cross the finish line with 30 seconds left of his 5-minute headstart over Lidia, to a standing ovation from the Japanese audience.