The lender says it is considering closing its centres in Birmingham, Chester, Doncaster and Newcastle and transferring these services to its two other centres in Glasgow and Northampton.
The proposals have resulted in all 145 staff from the centres being placed in consultation until the end of May.
A spokeswoman for Nationwide says: “It is too early to talk about redundancies. We are looking at proposals to close four of our centres. We believe that operating a smaller number of larger contact centres will allow us to become efficient.”