A prisoner convicted of assault is on the run after escaping from a NSW Hunter Valley jail.

Benjamin Wayne Scott, 31, slipped out of the minimum security section of Cessnock Correctional Complex around 10am (AEST) on Thursday.

Police and a dog unit are searching the surrounding area.

Scott had been serving a 12-month sentence for assault, robbery and driving offences.

His nine-month non-parole period was due to expire in January.

Police say Scott, who is of Caucasian appearance and medium build with brown hair, was wearing prison greens when he escaped.

He also has the name "Jordan" tattooed on his inner-right forearm.

Members of the public who see Scott are advised to keep clear and contact police immediately.

Scott is one of a number of recent escapees in NSW.

Michael Pitt, 33, jumped the dock and evaded corrective services officers after he was refused bail before Moree Local Court on Saturday.

Last Thursday Ryan O'Hara, 29, broke out of Parklea Correctional Centre in Sydney's Quakers Hill.

On Wednesday police recaptured the last of three men who escaped from Glen Innes Correctional Centre in April.