Organ donation is not only permissible in Islam, it is greatly encouraged. Service to mankind is the essence of Islam and, therefore, any act of beneficence is always promoted. Organ donation falls into this category because it serves to decrease human suffering and save lives and thereby upholds the Islamic value of doing goodness to others. In addressing Muslims, the Holy Quran states:
“You are the best people created for the good of mankind” (3:111).
This reveals that the purpose of a Muslims’ life is to serve fellow human beings and contribute in any way possible towards the betterment of all people.
The only point to keep in mind is that that if the donor runs in danger of losing his/her life in the donation process, then it is not permissible. Islam does not permit the sacrifice of one life for another, as that is considered equal to suicide.