Wilding, who will join the Omnicom-owned agency from Mindshare in June, will replace Jonathan Fowles, who left PHD in January.
He joins after eight years at Mindshare, where he is currently the strategy director, working on accounts including Nike, ITV and Times Newspapers.
Wilding will report to Philippa Brown, the PHD chief executive, and oversee the agency's planning approach across clients including Sainsbury's, COI, McCain, Cadbury and ING Direct.
He is the latest senior recruit to join PHD from Mindshare following the hiring last year of the former Mindshare Worldwide managing partner, Dominic Fawcett, as PHD's worldwide strategy director.
PHD has also appointed Hugh Cameron, the former DFGW and Freud Communications director, as its chief strategy officer.