The Nationwide Group Staff Union (NGSU) is an independent trade union in the United Kingdom which represents workers within the Nationwide Building Society and its associated companies.

[1] The NGSU was formed in 1990 by the merger of Anglia Building Society Staff Association and Nationwide Building Society Staff Association.

The Portman Group Staff Association (PGSA) transferred engagements to NGSU in 2008.

It is affiliated to the Trades Union Congress.

This article related to a United Kingdom trade union is a stub.