They are wanted for questioning over a range of crimes including murder and rape.
If you recognise anyone in the images, call South Yorkshire Police on 101 to help the force track them down.
1. Ahmed Farrah
Detectives investigating the murder of 21-year-old Kavan Brissett are appealing to find the man pictured.
Ahmed Farrah, who is also known as Reggie, is wanted in connection to Mr Brissett’s murder, as the investigation progresses.
If you see Farrah, call 999. If you have any other information as to where he might be, call either 101 or the incident room to speak to detectives directly on 01709 443507. You can also speak to Crimestoppers on 0800 555111. Please quote incident number 827 of 14 August 2018 when passing on information.
2. Mohammed Anwaar
Detectives are asking for your help to trace Mohammed Anwaar, who is wanted for failing to appear at court after being charged with two counts of conspiracy to supply Class A drugs, two counts of money laundering, possession of cannabis and possession of a firearm.
If you see him, please do not approach him but instead call 999 straight away. Any further information can be passed to South Yorkshire Police on 101 or Crimestoppers, anonymously, on 0800 555111 quoting incident number 251 of October 23, 2018.
3. John Eric Wells
Officers in South Yorkshire Police's Major Crime team are asking for help to find wanted man John Eric Wells.
Wells is also believed to go by the names Howard Walmsley and Howard Hemmings.
The 61-year-old, who is originally from South Yorkshire, is wanted in connection with three high value romance frauds, during which three victims lost money totalling more than £400,000.
The offences are reported to have taken place from September 2014 onwards. The victims lived in locations across the UK including Doncaster, Sussex and London.
Police would like to hear from anyone who has seen or spoken to Wells recently, or has information which may help officers with their enquiries. It is possible Wells is currently living outside the UK.
If you see him, or you have any information which may help, call South Yorkshire Police on 101 quoting investigation number A54532/17.
4. Loi Le
Police are asking for help to locate wanted man Loi Le.
Le, aged 49, who is a Vietnamese national, is wanted in connection with the reported rape of a child in 2012 or 2013.
The victim reported the matter to police in 2018 and an investigation began to identify a suspect and locate Le. Despite extensive enquiries, he has not yet been located.
Le may also be known by the names Tai Le or Cho Ngay Hanh Phuc. Anyone with information is asked to call South Yorkshire Police on 101 quoting investigation number 14/29287/18.