Dorota Gruca, married Giezek (born 5 December 1970 in Tarnogród) is a Polish marathon runner, who is a three-time national champion in the women's 5.000 metres.
She finished thirteenth at the 2005 World Championships, in a career best time of 2:27:46 hours. She also competed at the World Half Marathon Championships in 1995, 1996, 1998, 2000 and 2008