Mobbing, understood as persistent and long-lasting bullying of an employee, was defined in the labour law already in 2004. The Polish regulations explicitly condemn mobbing and provide legal means for protecting against it. In practice, however, it is extremely difficult to prove that mobbing has actually taken place. Referring to the doctrine and judicature, the author presents the definition of mobbing set out in the Polish regulations, focusing on these elements that have to take place in order to prove that an employer has actually behaved in this way; she also indicates what forms of employment it should be applied for. In her article, the author also pays attention to the need to reconsider changes in the binding regulations to make the fight against mobbing more effective.