Members-only unionism, also known as minority unionism, is a model for trade unions in which local unions represent and organize workers who voluntarily join (and pay dues) rather than the entire workforce of a place of employment. In such a model, a union election is not held by the entire workforce to determine whether a majority wishes for the workforce to be represented by a local branch of a national union, but a union can nonetheless exist to support members who pay dues.
While majority unions tend to possess and guard collective bargaining rights, minority-union members may be organized by the union to privately file group-presented grievances to management. The ability of such unions to meet on workplace grounds also relies upon the discretion of management.