Malcolm Page absconded from HMP Hatfield, Doncaster, on July 4, 2022.
Details of how he escaped have not yet been released.
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The 47-year-old was serving a three year sentence for supplying Class A drugs when he went missing.
South Yorkshire Police said: “Enquiries are ongoing to locate him, but police are now asking for your help.”
Page is white, around 5ft 7ins tall, slim and has short, dark brown hair.
He has a large scar on the top of his head, and has a green ink tattoo on his upper arm stating ‘Made in Ireland’.
South Yorkshire Police added: “It is believed he has links to Sheffield.
“Have you seen him? Do you know where he might be staying?
“If you see him, please do not approach him and instead call 999 quoting incident number 685 of July 4.”