Around 8:15 a.m. on Saturday, Greenstone OPP received a report of a male submerged in the water at High Hill Harbour off Highway 580 north of Beardmore.
Police responded to the call, along with Superior North Emergency Medical Services (EMS) and the Beardmore Fire Department.
At around 9:10 a.m., the body of a male who was submerged in the harbour was recovered.
The victim, identified as Bradley Penner, 35, of Nipigon, was pronounced dead at the scene.
The Thunder Bay OPP Forensic Identification Services Unit was dispatched to assist with the investigation.
The investigation is ongoing and police are awaiting results of the post-mortem examination.
Further information will be released as it becomes available.