The brewer issued a statement that said Golin had been appointed to work on the Stella Artois and Leffe brands.
3 Monkeys, meanwhile, has been appointed to work on Budweiser and Corona, as well as Cubanisto, which AB InBev describes as a rum-flavoured premium beer.
Both agencies will begin work on their respective brands from 1 January, with each in line for what is believed to be substantial six-figure sums.
Golin said it was unable to comment on the specific work it will carry out for InBev and 3 Monkeys did not respond to a request for comment.
A spokesman for InBev UK said: "We have completed our previously announced UK PR agency review and are pleased to confirm that we have appointed 3 Monkeys to work on our Budweiser, Corona and Cubanisto brands, and Golin to work on Stella Artois and Leffe. We appreciate the work of all agencies participating in the pitch process and thank them for their participation."
Mischief, which had previously worked on the Budweiser account, declined to pitch when the account came up for review in August.
Threepipe had held the Stella Artois account for the last four years before the August review.
Eddie May, Threepipe’s co-founder, said: "We’ve had four successful and enjoyable years working with the Stella Artois team and are very proud of the work we’ve delivered across brand and product PR, content creation and sponsorship activation; helping to restore the brand to its rightful premium positioning. It’s a great brand and we wish the team all the best for 2015 and beyond."