The agency said her appointment builds on the group’s political specialism following its acquisition of Centreground Political Communications in the summer.
Razi Rahman, managing director of Bell Pottinger Political, said: "I am delighted that Julie has joined our growing team. Her sectorial expertise and understanding of engaging with regulators and what their expectations are will greatly benefit are current and future clients. Clients will also benefit from her extensive experience in devising and executing successful public affairs and policy campaigns."
Minns said: "It is very exciting to join one of the leading political communications teams in the UK. Having worked both as a consultant and in-house, I hope my understanding of client expectations will further strengthen this highly creative and dynamic team in the lead-up to the general election next year."
News of her appointment follows that of Beth Armstrong, who has joined Bell Pottinger Political as a senior consultant from the Department for Education, where she was special adviser to then-Education Secretary Michael Gove until the summer reshuffle.