The Honda Jazz was found engulfed in flames in Hemsworth Road, Norton, at 1.15am.
A Renault Laguna estate was found alight in Park Spring Road, Little Houghton, Barnsley, at 8.50pm last night.
It is not yet known what started the fires.
Car fires tackled by South Yorkshire firefighters
Firefighters dealt with a car found burning in Sheffield in the early hours of this morning.
By The Newsroom
Wednesday, 22nd June 2016, 9:46 am
Updated Wednesday, 22nd June 2016, 10:58 am