Constantina Di?a (formerly Constantina Di?a-Tomescu born on January 23, 1970 in Turburea, Gorj County), is a Romanian long-distance runner, who specializes mainly in the half marathon and marathon.
She was the marathon gold medallist at the 2008 Beijing Olympics, having previously won a bronze medal at the 2005 World Championships in Athletics.
She also represented her country at the Olympics in 2000 and 2004.
She has a marathon best of 2:21:30 hours.
She was the champion at the 2005 IAAF World Half Marathon Championships – the first Romanian to win that honour.