The Canadian fashion mogul, 83, was branded a "sexual predator" by Justice Robert Goldstein in Toronto.
He is Andrew's second friend to be jailed for sex offences after Jeffrey Epstein was put behind bars in 2008.
Andrew, 64, was pictured with Nygard at his palatial home in the Bahamas in 2000.
His visit followed Nygard facing three sexual harassment complaints from ex-employees in the 90s, all of which he settled.
Nygard, who arrived at court in a wheelchair, faced charges dating from the 80s to the mid-2000s.
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