Most recently, Nair worked as a private consultant. Proir to that, he was the chief strategy officer of JWT and RMG Connect.
Nair will report to John Goodman, regional director, Ogilvy & Mather ASEAN.
Goodman said: "I've known Andre for many years. He's a very broad-based thinker with a knack for innovation and the persistence to drive change through an organisation. We're very glad to have him back."