The agency won the business after a final shoot-out against WPP-owned MediaCom, the incumbent on the account for the past 10 years.
ZenithOptimedia, Carat and OMD were knocked out of the running at an earlier stage in the pitch.
The move is part of a global review of Ikea’s media requirements, currently split between MediaCom and Mediaedge:cia.
Anna Crona, marketing manager for Ikea UK & Ireland, said: "We have enjoyed a healthy relationship with MediaCom over the last ten years - they have been integral to helping us move our brand forward here in the UK and launching our first
store in Ireland. Now together with Vizeum we are looking at moving our business on further with a fresh approach."