Bolt beat countryman Yohan Blake by .12 seconds, and Warren Weir took third to make it a 1-2-3 sweep for Jamaica.
The 25-year-old Bolt won the 100 on Sunday and now has five Olympic golds — a number he celebrated by hitting the ground and doing five push-ups a few meters past the finish line.
Bolt, who has long considered the 200 his favourite event, will try to make it 6-for-6 at the Olympics in the 4x100 relay, which starts Friday.
The last country to sweep the 200 was the United States in 2004.
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