SUMMARY The topic of final work for Master‘s degree is The Drug Habit Spread Prevention In Correctional Institutions. Due to this topic the main goal of this work is to specify particularities and evaluate the problems of implementing the measures of drug habit prevention in correctional institutions and to give some offers of possible solution of them and of improving underway prevention. Although drug habit prevention, implemented in different spheres and levels has common features, drug habit prevention in correctional institutions has some particularities. It is important that prevention would fulfil the changes of habits and opportunities of using drug in correctional institutions. For attaining this object the up-to-date state of drug habit spread in correctional institutions, tendencies and the reasons are analyzed. The main provision of legal acts, regulating the prevention of drug habit in correctional institutions, is also provided. The particularities of prevention measures applied in Vilnius’ correctional institutions are also investigated. The experience of implementing drug habit prevention measures in some foreign countries is being examined here as well. Summing up of the results are set forth in the conclusion of this work.