All emergency services were called to reports of someone in the River Nene this morning (Tuesday).
Police, ambulances, the air ambulance, off-road fire trucks and rescue boats were called to the St James Mill Road area of town just before 9am.
Emergency services, including the air ambulance which landed nearby and specialist divers, all attended following reports that someone was in the River Nene, near Millbrook Close.
A spokesman for the Warwickshire and Northamptonshire Air Ambulance (WNAA) said: "The WNAA was called to an event in Northampton this morning and was on scene at 0915.
"We attended a male patient in cardiac arrest following a drowning. The paramedics were able to achieve a return of spontaneous circulation.
"One of our rapid response vehicles also assisted and, working with EMAS, aided the transport of the patient to Northampton General."