Klingon law was the legal system of the Klingon Empire. The system was built upon the traditions and precedents developed over centuries of Klingon history.

In 2367, after he had become the Arbiter of Succession, Captain Jean-Luc Picard stated the Rite of Succession would proceed according to Klingon law. One of the challengers, Gowron, then challengingly asked Picard what he as a Human knew of Klingon law. Gowron subsequently told K'Ehleyr that Picard relied on her for knowledge of Klingon law and tried to bribe her. After the other challenger, Duras, had been killed by Worf, Worf defended himself against Picard, stating that he had acted within Klingon law and tradition. (TNG: "Reunion")

Later that year, Gowron asked what would happen if the House of Duras or its allies attempted to block his installation as Chancellor. Picard stated he would deal with any challenge according to Klingon law. Gowron expressed his doubts with Picard's assertion.

When Picard's authority as arbiter was challenged by Toral, Gowron announced that all who followed Toral were rejecting Klingon law. (TNG: "Redemption")

In 2368, Commander William T. Riker studied Klingon law and ritual after being asked by Worf to perform the ritual suicide Hegh'bat. (TNG: "Ethics")

According to this system, the fulfillment of a blood oath was considered an act of justice. (DS9: "Blood Oath")

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