West Brom moved back into the top six of the Championship with a win which brought Ipswich's long unbeaten run to an end.
Kieran McKenna's promotion hopefuls had not tasted defeat in the league since 26 August when they were beaten by Leeds, but excellent goals from Darnell Furlong and Grady Diangana underlined the Baggies' billing as the division's best home performers over the past year.
Victory also saw Carlos Corberan's team bounce straight back from their first defeat in five games, at Southampton before the international break, and reclaim a place in the play-off places.
Furlong's early balletic header set the ball rolling for the home side and a brilliant, sweeping counter-attack was neatly finished by Diangana soon after half-time to secure the points and inflict Ipswich's first league away defeat since January.