The 41-year-old Garcia takes over with Watford placed second in England's second tier Championship.
A club statement read: "Watford Football Club is delighted to confirm the appointment of Oscar Garcia as Head Coach, the Hornets having won the race against several high-profile English clubs to secure his services.
"Oscar's recent Championship experience, taking Brighton & Hove Albion into last season's Championship promotion Play-Offs, was a key factor in his appointment."
Source : AFP
Source: AFP