Mills, who is currently Group Chief People Officer for Compass Group PLC, will replace Chris Garside.
Garside has spent 10 years in the UK business, most recently as the UK & Ireland Managing Director since 2017. Having decided to further his career in an international role, Garside has taken a position within the Group International Clients team.
Mills was previously Managing Director for Compass Group UK & Ireland’s education business Chartwells, and has also held the role of HR Director for the UK & Ireland.
Commenting on the appointment, Dominic Blakemore said: “I’d like to thank Chris for the contribution he’s made to our business in the UK & Ireland over the last ten years. I’m delighted that Robin will be returning to the UK business to lead the UK & Ireland team on its growth journey.”