Stuart Law is leaving his role as West Indies head coach to take over at Middlesex from next season, the English county announced.
"It is a great privilege to be asked to coach Middlesex and to accept one of the plum jobs in world cricket," Law said.
"I have very much enjoyed my time with the West Indies and wish the staff and players every success.
"There is never a good time to leave but the opportunity to work with Middlesex for four years at the home of cricket was too good to decline."
After brief stints in charge of Sri Lanka and Bangladesh, the 49-year-old took over the Windies' reins in January 2017 and led his team to a memorable Test victory over England at Headingley last summer.
Law said his time in charge of the Windies had been "very enjoyable" "I believe we have made tremendous strides forward as a team during the past two years," he said.
His departure means West Indies will have a new coach in charge when England visit the Caribbean in January.
West Indies director of cricket Jimmy Adams said: "While I regret his leaving and the timing of it, I fully understand his reasons, and along with everyone at Cricket West Indies want to thank him for his dedication and commitment whilst in the role and wish him the very best of luck at Middlesex.
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