Michael William Powell, 30, is wanted for recall to prison as he has displayed poor behaviour while on licence.
He was sentenced to five years’ imprisonment for robbery in December 2011 and was released in June 2014.
Powell is described as white, 6ft tall, with a medium build and dark brown hair.
Although he whereabouts are unknown officers believe that Powell is in the Northampton or Milton Keynes areas.
Detective Inspector Graeme Wright, of York CID, said: Michael, if you see or hear this message, I strongly urge to hand yourself in at the nearest police station. We are not going to stop our searches for until you are back in custody. By remaining at large you are only making the consequences worse for yourself.
I am asking anyone who sees Powell to contact the police straight away. In particular, people living in Milton Keynes or Northampton, or anyone who seen him travelling between the two areas.
Anyone who can help to locate Michael Powell should contact North Yorkshire Police on 101, select option 1 and pass the details to the Force Control Room.
Or call Crimestoppers anonymously on 0800 555111, quoting reference number 12140112879.