We've complied a most wanted list of 20 people police are hunting for offences including murder, rape and robbery.
The independent charity Crimestoppers is after YOUR help - the people pictured could be anywhere in the UK or abroad. Do you recognise any of the faces in our rogues gallery? Do you know of their whereabouts?
Take a look at the images below to find out more. We've put together all the information available on each suspect - including physical descriptions, crime locations, dates and other vital information.
Each mugshot is also accompanied by a Crimestoppers reference number should you have any information that could help police in their inquiries.
Remember - contacting Crimestoppers is anonymous. You can call on 0800 555 111 or fill in an anonymous form online at crimestoppers-uk.org.
Crimestoppers constantly updates its most wanted list to urge members of the public to get in touch with any information that could help track suspects down.
Director of operations, Roger Critchell, said: "The Most Wanted section of our website is hugely successful because the public has a tremendous amount of faith in our charity and wants to ensure their community is free of criminals.
"The individuals on this list are wanted for some very serious crimes and I would urge anyone who has information on their whereabouts to contact Crimestoppers anonymously."
Also, click below to take a look at our Caught on Camera September edition.