A 15-strong team from InnerWorkings will manage printed communication materials, branded promotional products, sales promotions, BTL agencies, events, sponsorships and expenses relating to other marketing service providers.
The $45m-a-year deal comes ahead of the soccer World Cup which takes place in Brazil next year.
Mondelez has a 56% share of the Brazilian sugar and gum confectionery market and is also the domestic leader in chocolate ahead of Nestlé and Garoto, according to market analysts Mintel.