McIntyre, who joined on 6 August, was head of HR for Fox International Channels, part of News Corporation.
Prior to Fox, she was HRD of County Estate Management, a property developer, where she set up the personnel department from scratch.
Nicholas Coleridge, MD of Condé Nast Britain, said: "Hazel is not only highly professional and experienced, with a strong media background, but is a delightful person and sure to fit in well at Condé Nast."
McIntyre added: "I am excited to be joining Condé Nast. It is a rare opportunity to play a part in the continued growth of a company synonymous with innovative publishing. I relish the chance to develop HR alongside the rest of the business."