The phenomenon of mobbing or harassment at work is relatively new phenomenon in social relations. In this paper the author of the historical development of mobbing as a social phenomenon and defines his term. Special emphasis given by the mobbing in the workplace on that occasion to define the type and stage of mobbing, determine the characteristic of the abuser, abused and of companies in which it occurs mobbing. Also the author of this paper writes about the consequences of mobbing for the individual, work organization and society as a whole, and looks at the prevention of mobbing. Central part of this paper is focused on the legal protection of mobbing where the author presents legal regulations of protection of mobbing in the countries of the European Union, then all forms of legal protection (criminal and civil) in the Republic of Croatia.