The Professional Staff Union of the University of Massachusetts is a labor union local of professional staff and classified supervisors affiliated with the Massachusetts Teachers Association (MTA) and the National Education Association (NEA), with members on the Amherst and Boston campuses of the University of Massachusetts.

We are organized into two chapters, one on each of the two campuses. Additionally, PSU represents two bargaining units. Unit A covers professional staff on both campuses, and Unit B covers classified supervisors on the Amherst campus.

We are dedicated to supporting the dignity of the individual, the empowerment of workers, democracy, diversity, and the promotion of social justice.