Betteridge joins from Dennis where he was group advertising director for its Lifestyle Division, working across titles such as Maxim, Men's Fitness and Viz.
In his new role, he will report to Greame Tottle, Time Out's commercial director for magazine and online.
Tottle said Time Out is in the process of extending its commercial cross-platform and international offering. As a result of such expansion, he added, there was a need to appoint an ad director to lead the day-to-day management of the title.
In June, Time Out called on the Office of Fair Trading to examine BBC Worldwide's acquisition of rival travel guide publisher Lonely Planet, complaining that the corporation is breaking its own fair trading rules.
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