They want information to help locate suspects in cases and those believed to hold vital information about incidents.
Murders, romance fraud, burglaries, assaults and firearm offences could be solved with your help.
Anyone with information on the whereabouts of any of those wanted by the police should call South Yorkshire Police on 101 or Crimestoppers, anonymously, on 0800 555111.
9. Malicious communications
Christopher Swinglehurst, 23, is wanted over threats to damage property, malicious communications and making off without payment in the Doncaster area. Photo: Claire Lewis
10. Murder
Jamal Ali is wanted for questioning over the murder of Jordan Thomas, 22, who was shot dead in Sheffield as he sat in a car at traffic lights in 2014. Photo: Claire Lewis
11. Romance fraud
John Eric Wells, in his early 60s and also known as Howard Walmsley and Howard Hemmings, is wanted in connection with three high value romance frauds in which victims lost more than £400,000 between them. Photo: Claire Lewis
12. Murder
Mohammed Ali is wanted over the murder of Jordan Thomas, aged 22, who was shot dead as he sat in a car at traffic lights on Derek Dooley Way, Sheffield city centre, in December 2014. Photo: Claire Lewis