Emergency services were first spotted on the scene, on the corner of Printing Office Street and Priory Place, just after 3pm this afternoon.
Two paramedics were attending to the man who appeared to have a head injury. An eye-witness said he had been hit by a taxi. Two police officers also stood nearby.
Two police cars were parked at the top of Printing Office Street to prevent traffic from coming on to the street. Two officers were seen directing traffic.
Sheffield weather: Met Office issues thunderstorm warning as heatwave set to end with heavy rain and lightning
Lakeside Doncaster: Major search launched by emergency services after man gets into difficulty in water
Popple Street Sheffield: 'Several' people arrested as street is cordoned off by police
Rivelin Valley Road Sheffield: Body found after police search of Rivelin Valley
Hosepipe ban: Reservoir near Sheffield less than 15 per cent full as photos show how water levels have plunged
A police van was also parked outside the Free Press office, also on Printing Office street.
A South Yorkshire Police spokesman said: “Officers were called to reports of a collision in Printing Office Street, Doncaster at about 3pm this afternoon.
It is believed that a car, a red Peugeot, was involved in a collision with a male pedestrian.
The man has been taken to hospital for treatment. His injuries are not thought to be life threatening.
The road was temporarily closed while the incident was dealt with.”
A spokesman for South Yorkshire Ambulance Trust said: “We were called at 14.56pm to reports of a car and a pedestrian being involved in a collision.
“We sent an ambulance and we took a male in his 70s to Doncaster Royal Infirmary. His injuries are unknown.”