A grievance is a complaint or claim made by an employee or labor organization against an employer. The complaint typically alleges that the employer has not followed an agreement or written policy, or that the employer has not followed the law as it pertains to conditions of employment.

Grievance claims are often based on conditions laid out in a collective bargaining agreement. Most collective bargaining agreements also contain procedures that must be followed when a grievance is filed.

Among other issues, grievance complaints can involve concerns about salary, promotions, harassment, or discrimination.