Tilstone has been head of Citroën’s digital marketing since 2007 and held a number of marketing roles within the company.
He will take up the new post on 1 November.
This year, Citroën has ramped up its marketing strategy with a number of “innovative” initiatives to build the brand.
It launched its first product placement activity with a Citroën featuring in the video for Pixie Lott’s single.
Citroën also partnered with men’s magazine GQ to launch a branded concept car.
The car marque also launched a digital camapaign for its New C3 range to inject humour into the brand.