The new findings represent a 44% increase in business travellers using the budget airline, having recorded only 8.4 million passengers for business in 2010.
Carolyn McCall, chief executive of Easyjet, said: "The increase in business travellers flying with Easyjet shows that we are delivering on the strategy we launched in 2010 to increase our appeal to the business travel sector.
"Recession and austerity have also encouraged business passengers across Europe to sample Easyjet and when they do so they like the experience and the great value and tend to stay with us.
"95 per cent of passengers travelling for business say they will fly with us again, which shows that this focus by businesses on value is here to stay."
The news marks a trend for budget airlines targetting corporate travel, with Ryanair also introducing additional services for business travellers.