A spokesperson said: “Around 08:55 on Sunday, we were made aware of the death of a 46-year-old man at HMP Edinburgh.
“There do not appear to be any suspicious circumstances and a report will be submitted to the procurator fiscal.”
The Scottish Prison Service said: “Every death, whether in prison custody or in our communities, is a tragedy for all those who knew and supported the individual.
“Following the death of someone in our care, Police Scotland are advised, and the matter reported to the Procurator Fiscal.
“Fatal Accident Inquiries are held in due course.”
