The firm behind hotel chains Holiday Inn and Crowne Plaza will review agency support across its brands and major markets.
The review will affect all its PR agency relationships, including Weber Shandwick in the US, Hill & Knowlton in China, Asda'a Burson-Marsteller in the Middle East and Henry's House in the UK. Agency representatives will be called to a meeting in two week's time to explain the process.
IHG's total global PR spend is believed to be worth over $2m annually.
Advertising, design and photographic agencies will also be affected by the review.
IHG owns seven brands and is the world's largest hotel company by number of rooms.
See this week's issue for more details on the review.