The powerful noble families of the Klingon Empire, whose leaders sit on the High Council and whose feuds, alliances and questions of honour shape Klingon politics in every era.
Klingon society is organised around Houses, extended families usually named after their head. The greatest hold seats on the High Council under the Chancellor, and a House's standing can be destroyed by dishonour, as Worf learns when the House of Mogh is blamed for the Khitomer massacre in Sins of the Father.
The rivalry between the Houses of Mogh and Duras runs through The Next Generation and erupts into civil war in Redemption. Deep Space Nine adds the House of Martok, which adopts Worf, and plays the customs for comedy in The House of Quark.
Discovery shows an earlier age in which twenty-four Great Houses are divided until T'Kuvma calls them together, and L'Rell later unites them as Chancellor.