Jas Hennessy & Co., commonly known simply as Hennessy, is a French producer of cognac, which has its headquarters in Cognac, France.
It is one of the "big four" cognac houses, along with Martell, Courvoisier, and Rémy Martin, who together make around 85% of the world's cognac. Hennessy sells approximately 70 million bottles of its cognacs per year, making it the world's largest cognac producer, and in 2017 its sales represented around 60% of the US cognac market. As well as distilling cognac eaux-de-vie itself, the company also acts as a negociant.
The brand is owned by Moët Hennessy, which is in turn owned by LVMH (66%) and Diageo (34%), who act as a non-controlling shareholder. Hennessy pioneered several industry-standard practices in the world of cognac, and its association with luxury has made it a regular point of reference in popular culture, especially in hip hop.