West Brom sacked Ryan Mason after seven months in charge.
The 34-year-old signed a three-year contract at The Hawthorns last June.
The decision comes just hours after the Baggies lost 2-1 to Leicester. The result leaves the Baggies in 18th place after losing six of their last eight Sky Bet Championship matches.
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Sky Bet Championship match highlights between Leicester City and West Bromwich Albion
A statement published on the club’s official website read: “West Bromwich Albion have today parted ways with their men’s first team manager Ryan Mason.
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“Head coach Nigel Gibbs and first-team coach and head of performance Sam Pooley have also left The Hawthorns.
“The club would like to thank Ryan, Nigel and Sam for their efforts and wish all three well for the future.
“First-team coach James Morrison will oversee first-team operations on an interim basis until new staff are appointed.
“The process of recruiting a new men’s first team manager and staff is underway.”
West Brom’s next five Championship fixtures
Middlesbrough (h) – Friday 16 January 8pm – Sky Sports Football Live Stream
Norwich (h) – Tuesday 20 January 7.45pm – Sky Sports+ live broadcast
Derby (a) – Friday 23 January, 8pm – Sky Sports Football Live Stream
Portsmouth (a), Saturday January 31, 3pm
Stoke (h) – Saturday 7 February, 3pm
