Police were called to the scene in Carr House Road, Hyde Park, on Sunday at 10am.
A 61-year-old man has been arrested on suspicion of murder.
In a statement, South Yorkshire Police said: “An investigation is underway after a body was discovered at an address in Doncaster yesterday morning.
“On attending the scene, police found the body of a woman.
“At this time, the woman’s death is being treated as suspicious and enquiries are ongoing to ascertain the exact circumstances surrounding her death.”
The suspect remains in custody today.