The agency won the account following a competitive three-way pitch. The account will be led by campaigns director Louise Andrews.
Wildfire has been given responsibility for repositioning the global brand as the UK's leading audio supplier and shifting perceptions that Pioneer is only a TV manufacturer.
The agency will drive interest and conversations around the brand and channel Pioneer's reach to new audiences, which will include online communities.
Debby Penton, managing director, Wildfire PR, said: 'Having worked with Humax and Jabra for more than seven years and positioned both brands at the forefront of their markets, we are confident that we can help broaden public awareness of the technical excellence that Pioneer has historically been famous for.'