The Men in Black first took the field at Watford's Hertfordshire home in 1997 but their emphatic 40-7 victory over Edinburgh in the Heineken Cup this weekend brought the curtain down on their tenancy.
Saracens will now move to their new Allianz Park home in Barnet.
A statement on Watford's official website concluded: "Everyone at Watford FC hopes Saracens continue to enjoy success as their new era begins."
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