Andrew Paton ( 13), was with his grandfather Sandy Malcolm in their speedboat on Loch Fyne in September when they were hit by a large wave which nearly capsized the boat.
Sandy, who is 82, fell overboard into the cold waters of the loch and drifted away.
Andrew then sprang into action, throwing Sandy a rope, hauling him to the side of the boat and tying him on to it, and stopping the boat’s engine. He then dialled 999 to raise the alarm.
The Coastguard put out an emergency relay and other boats in the area made their way to Sandy and Andrew, where Sandy was helped back on board the boat by fellow sailors.
Eastwood head teacher Stuart Maxwell who nominated Andrew for the award said: “We are exceptionally proud of the manner in which Andrew dealt with this difficult situation and are very pleased that his bravery is being recognised. ”
Presenting this year’s Citizen of the Year Award Provost Carmichael said: “I feel honoured to present this year’s award to a young man, Andrew Paton, who has shown outstanding maturity and heroism.
“At just 13 years old, Andrew saved his grandad’s life. This exceptional act has shown true bravery, spirit and courage. I am delighted to recognise and thank Andrew. He truly deserves to be our Citizen of the Year.”