He won it once, in 2008.
Nico Rosberg won the 2016 F1 Championship.
Nico Rosbeg won the 2016 F1 World Championship, the first time in his career.
Lewis has won one F1 World championship in the year 2008 (This year)
Lewis Hamilton won the 2008 F1 world championships from Phillipe Massa by one point. *Felipe Massa*
In 2006 Fernando Alonso won the Driver's Championship for Renault, who consequently won the Constructor's Championship
Jenson Button won the 2008 season for Brawn GP, who also won the Constructor's Championship.
Sebastian Vettel won the 2010 F1 World Championship. It was his first World Championship win.