This includes six new partners in its London office: Paul Raeburn, Katharine Peacock, Sonal Patel, Alexandra Abreu Loureiro, David Litterick and Stuart Donnelly.
In the US, there were four promotions, including Mylene Mangalindan (San Francisco), Max McGahan (Chicago), Lauren Nadig (Dallas), Emma Schultz (Washington DC).
Other new partners include Dominic Whiting (Abu Dhabi), Jade Mamarbachi (Dubai), Tristan Hills-Bos (Dubai), Joachim Peter (Berlin), Felix Morlock (Frankfurt), Fiona Wright (Brussels), Henrik Bernitz (Stockholm), David Ashton (Hong Kong), Sunitha Chalam (Hong Kong), Joanna Donne (Singapore), and Roberta Lippi (Sao Paulo).
Brunswick, which was ranked the tenth largest global PR consultancy in PRWeek's Annual Business Report, with annual fee income of $255.9m (£194m), said the record partner intake reflects the "substantial investments" the consultancy is making in multiple markets.
"We are absolutely delighted to welcome these twenty-one terrific colleagues into the Partnership. Our new partners reflect the enormous depth and strength of talent that we have at the firm," Brunswick CEO Neal Wolin said.
Louise Charlton, co-founder and vice chairman of Brunswick, added: "These promotions underscore Brunswick’s deep focus on developing its huge base of talent and growing its strong cadre of senior colleagues."