Wyld is currently the director of corporate comms at Network Rail, a role he has held since May 2014. He will move to the engineering firm, which makes jet engines and other power generation systems, at a yet to be confirmed date later this year.
Before Network Rail, Wyld worked for Unilever. He has also worked in agencies and began his career as a speechwriter for Lib Dem MP Simon Hughes.
In his new role, Wyld will oversee the full corporate comms agenda including media, internal comms, digital and brand. His remit will also include government relations, which is being brought into the global corporate affairs function. He will report to group strategic marketing director Ben Story.
Wyld will succeed Peter Morgan, who has decided to leave Rolls-Royce after eight years "to pursue his many outside interests", according to a press release from the company.
CEO Warren East said: "Rolls-Royce has transformed considerably and although we have a great deal more to do I would like to thank Peter for his tireless effort and expert guidance, and we wish him all the best.
"Realising our ambition to become a highly trusted, more resilient company will require further business transformation, alongside cultural and behavioural changes, and I am delighted to welcome Barney to help us as we continue on this journey."
In his profile in the 2017 PRWeek UK Power Book, Wyld said that the PR industry needed to provide better training to its staff.