Bolt, 29, had won the 100m and 200m in Rio and is the only man to win all three sprint events at three Games.
He combined with Asafa Powell, Yohan Blake and Nickel Ashmeade to lift gold in a time of 37.27 seconds.
Japan won a surprise silver and the USA were disqualified to hand Canada bronze and lift Britain up to fifth.
"There you go, I'm the greatest," said Bolt, who has won gold in the 100m, 200m and 4x100m relay at the last three Games.
He intends to retire after the 2017 World Championships in London and will not compete at Tokyo 2020, at which point he will be nearly 34.
Bolt's haul of nine golds is the joint highest among Olympic athletics.
He is now equal with USA sprinter and long jumper Carl Lewis, who won nine golds over four Games, and Finnish long-distance runner Paavo Nurmi.
Usain Bolt's 'triple triple' came two days before his 30th birthday
* Story monitored from BBC
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