Dyson, 55, played Test cricket for Australia in the 1980s
John Dyson has been sacked as coach of West Indies with immediate effect.
The Australian was axed following a meeting of the West Indies Cricket Board, with assistant David Williams taking over on temporary basis.
Dyson's exit follows recent Test and one-day series defeats to Bangladesh, although the West Indies were forced to field severely weakened teams.
His reign began strongly in 2007, with a Test win over South Africa and a home Test series win over England.
However, the 55-year-old former Sri Lanka coach was strongly criticised after misreading the rain regulations in a one-day international against England in Guyana, an error that gifted the match to England, who ultimately won that series 3-2.
Dyson, a former opening batsman who played 30 Tests for Australia, was linked with the job of coaching England when Andy Flower held the role in an interim capacity at the start of the year.
Flower was ultimately given the job by right at the start of the English season.
Meanwhile, West Indies team manager Omar Khan has been replaced by former Test bowler Lance Gibbs for the ICC Champions Trophy in the autumn due to the "special circumstances" of the tour.
There are also reports that West Indies will send a shadow side to South Africa for the tournament despite the leading players declaring their availability after boycotting the Tests against Bangladesh because of a dispute over contracts and payments.
Dyson was a New South Wales regular for many years and played 30 Tests for Australia between 1977-84, scoring 1,359 runs at an average of 26.64.
He became coach of Sri Lanka in 2003, an appointment that came as a surprise, given that he had little coaching experience at higher levels.
After two years there he was replaced by Tom Moody, and himself spent two years away from international coaching before he replaced fellow Australian Bennett King in the West Indies role.