Diyya (plural: Diyyat; Arabic: دية‎) is financial compensation paid to the heirs of a victim. In Arabic, the word means both blood money and ransom.

The Qur'an specifies the principle of Qisas (i.e. retaliation), but prescribes that one should seek compensation (Diyya) and not demand retribution.

The Qur’an directed to pay Diyyat just according to this law both in case of intentional as well as un-intentional murder. A variation of Diyat was present in pre-Islamic Arabia, where it was paid in terms of goods or animals rather than cash. In Sharia law, Diyat should be paid in terms of cash to avoid possible fraud on the part of the criminal. In Islamic and Arab traditions, blood money is the fine paid by the killer or his family or clan to the family or the clan of the victim (comparable to the traditions of weregild and główczyzna). It is unlawful for a believer to kill a believer except if it happens by accident. And he who kills a believer accidentally must pay Diyyat to the heirs of the victim except if they forgive him. The tradition finds repeated endorsement in Islamic tradition; several instances are recorded in the Hadith, which are the acts of Muhammad.