The thesis discusses the problem of organ donation. The main focus is the ethics of donating (by either an alive or a dead donor) and the response of different religions to that matter: if they support the donation or are against it. A short interview was done with members of most of the chosen religions, so an exact insight to the matter is given. The thesis also discusses the progress of the medical science, how much it is supported by religions and where is the line. Also, an interview with a representative of Slovenija Transplant was done; it presents the activities of the organization and the process of a transplant and also some restraints and rejections of a transplant. Then follows an analysis of an opinion poll about organ donation: what is people's opinion about medicine, do they think that religions support the donation or not. It has been found out that people still do not know much about this problem. A lot of them does not consider brain death as actual death. A lot of them support the donation, but only few actually opted as only 1% of people is opted. In general, religions support organ donation, but some of them have some restrains or conditions for the donation. It is the same with medical science where religions have some restrains as well and put bounds to the medical progress.