Australian Stuart Law will leave his role as West Indies head coach to take over at English County Championship side Middlesex from next season.
The former Australia batsman has agreed a four-year deal with the county and will begin his new job in January following West Indies' tours of India and Bangladesh.
"It is a great privilege to be asked to coach Middlesex and to accept one of the plum jobs in world cricket," he 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."
Law enjoyed a long playing career in county cricket with Essex, Lancashire and Derbyshire before moving into coaching.
After brief stints in charge of Sri Lanka and Bangladesh, the 49-year-old became West Indies head coach in January 2017 and led his team to a memorable Test victory at Headingley last summer.
Law will lead Middlesex in all formats, which means Daniel Vettori will stand down as Twenty20 coach.
Richard Johnson has been in charge of the 2016 champions in the County Championship since July, following Richard Scott's departure.
Middlesex managing director of cricket Angus Fraser said: "We have always tried to recruit the right kind of person at Middlesex and we believe Stuart is the right man to build on the foundations laid over the past decade.
Law's decision to join Middlesex means West Indies will have a new coach in charge when England visit in January.
Windies 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."
Law, who himself played one Test and 54 one-day internationals, will join fellow Australian coaches Jason Gillespie (Sussex) and Michael di Venuto (Surrey) in the championship.
