World Car of the Year 2015 is the Mercedes C-Class

Mercedes has scored an amazing hat-trick in the World Car of the Year awards with three category wins
Mercedes-Benz walked away with three prizes at the World Car Awards 2015 held at the New York Motor Show. The Mercedes C-Class was named overall World Car of the Year, while the S-Class Coupe won the World Luxury Car trophy and the AMG GT was named World Performance Car of the Year.
Source: http://www.autoexpress.co.uk/