The woman, from Scawsby, was found at an address in Stanley Road at around 10.10pm on Friday following reports of a disturbance.
She was taken to Doncaster Royal Infirmary where she later died from her injuries.
The body of a 36-year-old man was also found at the scene and a spokesman for South Yorkshire Police said detectives were not looking for anyone else in connection with the deaths.
Officers have appealed for anyone who may have witnessed a disturbance in the area that evening or who has any information that could assist officers with the investigation to call South Yorkshire Police on 101 quoting incident number 1349 of 25 October. Alternatively, people can call Crimestoppers anonymously on 0800 555 111.