Fellows was formerly Kellogg’s corporate communications manager and previously headed up PR at Asda.
She replaces Chris Wermann and will report to Kellogg’s UK managing director Greg Peterson.
As corporate affairs director Fellows will have responsibility for Kellogg’s corporate and government relations, including the cereal manufacturer’s relationship with trade bodies such as the Food and Drink Federation.
Kellogg has recently signed up to the Government’s Change4Life “Great Swapathon” campaign to encourage people to swap to a healthier lifestyle.
Wermann is moving to Argos owner Home Retail Group as corporate affairs director.