Scotland's 58 stores will all have staff trained in life-saving CPR along with the equipment, in a new deal with the British Heart Foundation.
The supermarket giant has spent more than £500,000 on the project that it hopes will increase the survival chances of someone suffering a heart attack.
It means any member of the public will be able to deliver an electric shock to the heart when someone is having a cardiac arrest.
All the new devices are expected to be in place by the end of the year.
More than 60,000 people suffer a cardiac arrest outside of hospital every year in the UK, but only one in ten people survive.
The chances of surviving cardiac arrest fall by 10% every minute that the patient isn't given CPR and defibrillation.
The British Heart Foundation's chief executive Simon Gillespie, said: "This really could mean the difference between life and death for someone having a cardiac arrest while doing something as ordinary as shopping."