Communications for the brands was previously managed in-house.
Mercieca will launch new products for Chupa Chups, Mentos and Smint to consumers, whilst building the company’s profile in grocery trade media.
Perfetti Van Melle general manager Roel Nouws said: "Mercieca came to us with strong creative ideas that demonstrated they understand our different target audiences, whilst emphasising their solid food and drink credentials.
"With an array of NPD in the pipeline, 2015 is set to be one of the biggest and best years ever for Perfetti Van Melle and we’re pleased to be working with Mercieca to help us engage with consumers and retailers across the UK."
Mercieca PR director Gemma Oakes added: "Our brief includes making noise around the forthcoming new product launches, building brand awareness as well as experiential activity. Our B2B team will also be focusing on cementing Perfetti Van Melle as an authoritative voice within trade media - maximising our knowledge of the grocery trade."