This chapter is entitled “Discipline and the Selected Manifestations of Employee Behaviour”. It discusses psycho-social and organisational causes of counterproductive behaviour, as well as the selected manifestations of unethical and criminal behaviour such as sabotage, theft, financial fraud and corruption. The author also describes types of behaviour harmful to employees, for example, mobbing, stalking, harassment and blackmail. Every sub-chapter contains information concerning manifestations of various types of unethical and criminal behaviour, as well as methods of preventing such behaviour. The author indicates the limitations of various forms of preventing unethical behaviour and problems with their identification. The chapter ends with conclusions concerning possible further research.