Joe Heayes is currently change and propositions manager and Simon Cradock is a business development manager for the South East.
Gary Salter, head of corporate accounts for group intermediary sales at Nationwide, said: "The appointments of Joe and Simon will provide continuity and demonstrate our ongoing commitment to developing and rewarding the talent we have at Nationwide.
“Promoting two people who have made a significant contribution to the intermediary division in recent years will ensure that we continue to provide an excellent level of service to our corporate account partners."